diff --git a/Autoarr/Autoarr.c b/Autoarr/Autoarr.c
index d6ee333..e22daaf 100644
--- a/Autoarr/Autoarr.c
+++ b/Autoarr/Autoarr.c
@@ -12,7 +12,7 @@ define_Autoarr(float)
 define_Autoarr(double)
 define_Autoarr(Unitype)
 
-// right func to clear array of unitype values
+//right func to clear array of unitype values
 void Autoarr_Unitype_clear(Autoarr(Unitype)* ar){
     for(uint32 blockI=0;blockI<ar->blocks_count-1;blockI++)
         for(uint32 elemI=0;elemI<ar->max_block_length;elemI++)
diff --git a/Autoarr/Autoarr.h b/Autoarr/Autoarr.h
index 1ecacd3..5f12633 100644
--- a/Autoarr/Autoarr.h
+++ b/Autoarr/Autoarr.h
@@ -19,7 +19,7 @@ declare_Autoarr(float)
 declare_Autoarr(double)
 declare_Autoarr(Unitype)
 
-// right func to clear array of unitype values
+//right func to clear array of unitype values
 void Autoarr_Unitype_clear(Autoarr(Unitype)* ar);
 
 #define Autoarr_foreach(ar,elem,codeblock)({\
diff --git a/Autoarr/StringBuilder.c b/Autoarr/StringBuilder.c
index 1eb729e..6a12265 100644
--- a/Autoarr/StringBuilder.c
+++ b/Autoarr/StringBuilder.c
@@ -25,6 +25,7 @@ void StringBuilder_append_int64(StringBuilder* b, int64 a){
     uint8 i=0;
     if(a==0){
         Autoarr_add(b,'0');
+        return;
     }
     else if(a<0){
         Autoarr_add(b,'-');
@@ -44,6 +45,7 @@ void StringBuilder_append_uint64(StringBuilder* b, uint64 a){
     uint8 i=0;
     if(a==0){
         Autoarr_add(b,'0');
+        return;
     }
     char buf[24];
     while(a!=0){
@@ -51,13 +53,17 @@ void StringBuilder_append_uint64(StringBuilder* b, uint64 a){
         a/=10;
     }
     string rev=string_reverse((string){buf,i});
+    printf("\e[95mrev:%s\n",string_cpToCptr(rev));
     StringBuilder_append_string(b,rev);
     free(rev.ptr);
 }
 
 void StringBuilder_append_double(StringBuilder* b, double a){
     char buf[32];
-    sprintf(buf,"%lf",a);
+    IFWIN(
+        sprintf_s(buf,32,"%lf",a),
+        sprintf(buf,"%lf",a)
+    );
     StringBuilder_append_cptr(b,buf);
 }
 
diff --git a/DtsodParser/DtsodV24.c b/DtsodParser/DtsodV24.c
index f5ce5b4..21b0984 100644
--- a/DtsodParser/DtsodV24.c
+++ b/DtsodParser/DtsodV24.c
@@ -1,24 +1,24 @@
 #include "DtsodV24.h"
 
-// returns UniNull if key not found
+//returns UniNull if key not found
 Unitype DtsodV24_get(Hashtable* dtsod, char* key){
     return Hashtable_get(dtsod, key);
 }
 
-// adds or sets value
+//adds or sets value
 void DtsodV24_addOrSet(Hashtable* dtsod, char* key, Unitype value){
     Unitype* val=Hashtable_getptr(dtsod, key);
     if(val) *val=value;
     else Hashtable_add(dtsod, key, value);
 }
 
-// checks for dtsod contains value or dont
+//checks for dtsod contains value or dont
 bool DtsodV24_contains(Hashtable* dtsod, char* key){
     Unitype* val=Hashtable_getptr(dtsod, key);
     return val!=NULL;
 }
 
-// replaces value with UniNull if key exists in dtsod
+//replaces value with UniNull if key exists in dtsod
 bool DtsodV24_remove(Hashtable* dtsod, char* key){
     Unitype* val=Hashtable_getptr(dtsod, key);
     if (!val) return false;
@@ -26,7 +26,7 @@ bool DtsodV24_remove(Hashtable* dtsod, char* key){
     return true;
 }
 
-// frees memory including memory of elements (hashtables, autoarrs, etc.)
+//frees memory including memory of elements (hashtables, autoarrs, etc.)
 void DtsodV24_free(Hashtable* dtsod){
     Hashtable_free(dtsod);
 }
\ No newline at end of file
diff --git a/DtsodParser/DtsodV24.h b/DtsodParser/DtsodV24.h
index 1328f93..26a116c 100644
--- a/DtsodParser/DtsodV24.h
+++ b/DtsodParser/DtsodV24.h
@@ -9,22 +9,22 @@ extern "C" {
 //parses text to binary values
 Maybe DtsodV24_deserialize(char* text);
 
-// creates text representation of dtsod
+//creates text representation of dtsod
 char* DtsodV24_serialize(Hashtable* dtsod);
 
-// returns value or UniNull if key not found
+//returns value or UniNull if key not found
 Unitype DtsodV24_get(Hashtable* dtsod, char* key);
 
-// adds or sets value
+//adds or sets value
 void DtsodV24_addOrSet(Hashtable* dtsod, char* key, Unitype value);
 
-// checks for dtsod contains value or dont
+//checks for dtsod contains value or dont
 bool DtsodV24_contains(Hashtable* dtsod, char* key);
 
-// replaces value with UniNull if key exists in dtsod
+//replaces value with UniNull if key exists in dtsod
 bool DtsodV24_remove(Hashtable* dtsod, char* key);
 
-// frees memory including memory of elements (hashtables, autoarrs, etc.)
+//frees memory including memory of elements (hashtables, autoarrs, etc.)
 void DtsodV24_free(Hashtable* dtsod);
 
 #if __cplusplus
diff --git a/DtsodParser/DtsodV24_exported.c b/DtsodParser/DtsodV24_exported.c
index 1ffb67b..3ba9f31 100644
--- a/DtsodParser/DtsodV24_exported.c
+++ b/DtsodParser/DtsodV24_exported.c
@@ -1,8 +1,8 @@
-// 
+//
 // I planned to export functions from DtsodV24.h, 
 // but C# P/Invoke can't get returned values for some reason.
 // Following functions return values by pointer, which looks in C# like out parameter
-// 
+//
 
 #if __cplusplus
 extern "C" {
@@ -10,39 +10,39 @@ extern "C" {
 
 #include "DtsodV24.h"
 
-// parses text to binary values
+//parses text to binary values
 EXPORT void CALL kerep_DtsodV24_deserialize(char* text, Hashtable** output, char** errmsg){
     Maybe r=DtsodV24_deserialize(text);
     *errmsg= r.errmsg ? r.errmsg : NULL;
     *output=r.value.VoidPtr;
 }
 
-// creates text representation of dtsod
+//creates text representation of dtsod
 EXPORT void CALL kerep_DtsodV24_serialize(Hashtable* dtsod, char** output){
     *output=DtsodV24_serialize(dtsod);
 }
 
-// returns value or UniNull if key not found
+//returns value or UniNull if key not found
 EXPORT void CALL kerep_DtsodV24_get(Hashtable* dtsod, char* key, Unitype* output){
     *output=DtsodV24_get(dtsod, key);
 }
 
-// adds or sets the value
+//adds or sets the value
 EXPORT void CALL kerep_DtsodV24_addOrSet(Hashtable* dtsod, char* key, Unitype value){
     DtsodV24_addOrSet(dtsod, key, value);
 }
 
-// checks for dtsod contains value or dont
+//checks for dtsod contains value or dont
 EXPORT void CALL kerep_DtsodV24_contains(Hashtable* dtsod, char* key, bool* output){
     *output=DtsodV24_contains(dtsod, key);
 }
 
-// replaces value with UniNull if key exists in dtsod
+//replaces value with UniNull if key exists in dtsod
 EXPORT void CALL kerep_DtsodV24_remove(Hashtable* dtsod, char* key, bool* output){
     *output=DtsodV24_remove(dtsod, key);
 }
 
-// replaces value with UniNull if key exists in dtsod
+//replaces value with UniNull if key exists in dtsod
 EXPORT void CALL kerep_DtsodV24_free(Hashtable* dtsod){
     DtsodV24_free(dtsod);
 }
diff --git a/DtsodParser/DtsodV24_serialize.c b/DtsodParser/DtsodV24_serialize.c
index d9f0fde..5b7c455 100644
--- a/DtsodParser/DtsodV24_serialize.c
+++ b/DtsodParser/DtsodV24_serialize.c
@@ -1,7 +1,7 @@
 #include "DtsodV24.h"
 #include "../Autoarr/StringBuilder.h"
 
-// 65536 max length!
+//65536 max length!
 #define STRB_BC 64
 #define STRB_BL 1024
 
@@ -47,11 +47,6 @@ void __AppendValue(SerializeSharedData* shared, Unitype u){
                 }
                 addc('"');
                 break;
-            case Char:
-                addc('\'');
-                addc(u.Char);
-                addc('\'');
-                break;
             case Bool:
                 StringBuilder_append_cptr(b, u.Bool ? "true" : "false");
                 break;
diff --git a/Hashtable/Hashtable.c b/Hashtable/Hashtable.c
index 7bddbb6..9f66450 100644
--- a/Hashtable/Hashtable.c
+++ b/Hashtable/Hashtable.c
@@ -64,7 +64,7 @@ void Hashtable_add(Hashtable* ht, char* key, Unitype u){
     Hashtable_add_pair(ht,KVPair(key,u));
 }
 
-// returns null or pointer to value in hashtable
+//returns null or pointer to value in hashtable
 Unitype* Hashtable_getptr(Hashtable* ht, char* key){
     Autoarr(KeyValuePair)* ar=getrow(ht,key,false);
     uint32 arlen=Autoarr_length(ar);
diff --git a/Hashtable/Hashtable.h b/Hashtable/Hashtable.h
index 90ab0ac..14714de 100644
--- a/Hashtable/Hashtable.h
+++ b/Hashtable/Hashtable.h
@@ -9,35 +9,35 @@ extern "C" {
 #include "KeyValuePair.h"
 
 typedef struct Hashtable{
-    uint8 hein;  // height=HT_HEIGHTS[hein] 
+    uint8 hein;  //height=HT_HEIGHTS[hein] 
     Autoarr(KeyValuePair)* rows; // Autoarr[height]
 } Hashtable;
 
 Hashtable* Hashtable_create();
 void Hashtable_free(Hashtable* ht);
 
-// amount of rows
+//amount of rows
 uint32 Hashtable_height(Hashtable* ht);
 
-// adds charptr and value to new KeyValuePair
-// use cptr_copy() to create new string if needed
+//adds charptr and value to new KeyValuePair
+//use cptr_copy() to create new string if needed
 #define KVPair(key,value) (KeyValuePair){key,value}
 
-// 
+//
 // don't add pairs with the same keys,
 // or something weird will happen
-// 
+//
 void Hashtable_add_pair(Hashtable* ht, KeyValuePair p);
 void Hashtable_add(Hashtable* ht, char* key, Unitype u);
 
-// returns null or pointer to value in hashtable
+//returns null or pointer to value in hashtable
 Unitype* Hashtable_getptr(Hashtable* ht, char* key);
 
 Unitype Hashtable_get(Hashtable* ht, char* key);
 KeyValuePair Hashtable_get_pair(Hashtable* ht, char* key);
 bool Hashtable_try_get(Hashtable* ht, char* key, Unitype* output);
 
-// not implemented yet
+//not implemented yet
 void Hashtable_set_pair(Hashtable* ht, KeyValuePair p);
 void Hashtable_set(Hashtable* ht, char* key, Unitype u);
 
diff --git a/Hashtable/KeyValuePair.c b/Hashtable/KeyValuePair.c
index d07216e..c11ae9f 100644
--- a/Hashtable/KeyValuePair.c
+++ b/Hashtable/KeyValuePair.c
@@ -3,13 +3,13 @@
 define_Autoarr(KeyValuePair)
 
 
-// proper way to clear a KVP
+//proper way to clear a KVP
 void KeyValuePair_free(KeyValuePair p){
     free(p.key);
     Unitype_free(p.value);
 }
 
-// func for  KVP array clearing
+//func for  KVP array clearing
 void Autoarr_KeyValuePair_clear(Autoarr_KeyValuePair* ar){
     for(uint16 blockI=0; blockI < ar->blocks_count-1; blockI++)
         for(uint16 elemI=0; elemI < ar->max_block_length; elemI++)
diff --git a/Hashtable/KeyValuePair.h b/Hashtable/KeyValuePair.h
index afbc803..7f99dfb 100644
--- a/Hashtable/KeyValuePair.h
+++ b/Hashtable/KeyValuePair.h
@@ -14,10 +14,10 @@ typedef struct KeyValuePair{
 
 declare_Autoarr(KeyValuePair)
 
-// proper way to clear a KVP
+//proper way to clear a KVP
 void KeyValuePair_free(KeyValuePair p);
 
-// func to clear KVP array
+//func to clear KVP array
 void Autoarr_KeyValuePair_clear(Autoarr_KeyValuePair* ar);
 
 void printkvp(KeyValuePair p);
diff --git a/Hashtable/hash.h b/Hashtable/hash.h
index 2f575c5..b13db28 100644
--- a/Hashtable/hash.h
+++ b/Hashtable/hash.h
@@ -6,9 +6,9 @@ extern "C" {
 
 #include "../base/base.h"
 
-// djb2 hash function from http:// www.cse.yorku.ca/~oz/hash.html
+//djb2 hash function from http://www.cse.yorku.ca/~oz/hash.html
 uint32 ihash(char *str);
-// sdbm hash function
+//sdbm hash function
 uint64 lhash(char* str);
 
 #if __cplusplus
diff --git a/Makefile b/Makefile
index dfc7810..bdaefa9 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ TESTS=$(wildcard tests/*c) $(wildcard tests/**/*.c)
 OUTDIR=bin
 CMP=gcc
 
-all: clear_c clear_bin build_test build_lib
+all: build_test
 
 clear_c:
 	clear
@@ -19,11 +19,11 @@ clang: all
 TEST_FILE=$(OUTDIR)/kerep_test.com
 TEST_ARGS= -Wall -Wno-discarded-qualifiers $(SRC) $(TESTS) -o $(TEST_FILE)
 OPT_ARGS= -O1 -flto
-build_test:
+build_test: clear_bin
 	@echo -e '\n\e[96m----------------[build_test]----------------\e[0m'
 	$(CMP) $(OPT_ARGS) $(TEST_ARGS)
 
-build_test_dbg:
+build_test_dbg: clear_bin
 	@echo -e '\n\e[96m--------------[build_test_dbg]--------------\e[0m'
 	$(CMP) -O0 -g $(TEST_ARGS).dbg
 
@@ -40,6 +40,6 @@ LIB_FILE=kerep.so
 LIB_ARGS= -Wall -Wno-discarded-qualifiers \
 	-O1 -fPIC -shared -Wl,-soname,$(LIB_FILE)  \
 	$(SRC) $(TESTS) -o $(OUTDIR)/$(LIB_FILE)
-build_lib:
+build_lib: clear_bin
 	@echo -e '\n\e[96m-------------[build_lib]---------------\e[0m'
 	$(CMP) $(OPT_ARGS) $(LIB_ARGS)
diff --git a/SearchTree/SearchTree.h b/SearchTree/SearchTree.h
index 4d83bb1..d7ae5a9 100644
--- a/SearchTree/SearchTree.h
+++ b/SearchTree/SearchTree.h
@@ -7,7 +7,7 @@ extern "C" {
 #include "../base/base.h"
 
 typedef struct SearchTreeNode{
-    struct SearchTreeNode**** branches; // *STNode[8][8][4]
+    struct SearchTreeNode**** branches; //*STNode[8][8][4]
     Unitype value;
 } STNode;
 
diff --git a/StringFragment/StringBuilder.h b/StringFragment/StringBuilder.h
deleted file mode 100644
index 9369973..0000000
--- a/StringFragment/StringBuilder.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#pragma once
-
-#if __cplusplus
-extern "C" {
-#endif
-
-#include "../Autoarr/Autoarr.h"
-#include "StringFragment.h"
-
-typedef Autoarr(int8) StringBuilder;
-
-StringBuilder StringBuilder_create(uint16 max_blocks_count, uint16 max_block_length);
-void StringBuilder_append_char(StringBuilder* b, char c);
-void StringBuilder_append_cptr(StringBuilder* b, char* s);
-void StringBuilder_append_string(StringBuilder* b, StringFragment s);
-void StringBuilder_append_int64(StringBuilder* b, int64 a);
-void StringBuilder_append_uint64(StringBuilder* b, uint64 a);
-void StringBuilder_append_double(StringBuilder* b, double a);
-// returns StringFragment with '\0' at the end
-StringFragment StringBuilder_build(StringBuilder* b);
-
-#if __cplusplus
-}
-#endif
\ No newline at end of file
diff --git a/StringFragment/StringFragment.c b/StringFragment/StringFragment.c
deleted file mode 100644
index b3c0ca7..0000000
--- a/StringFragment/StringFragment.c
+++ /dev/null
@@ -1,42 +0,0 @@
-#include "StringFragment.h"
-
-// copies <length> characters from <ptr+offset> to new StringFragment (adding '\0' at the end)
-StringFragment StringFragment_extract(StringFragment str){
-    if(str.length==0) return stringNull;
-    StringFragment extr={
-        .offset=0,
-        .length=str.length,
-        .ptr=malloc(str.length+1)
-    };
-    str.ptr+=str.offset;
-    for(uint32 i=0; i<str.length; i++)
-        extr.ptr[i]=str.ptr[i];
-    extr.ptr[str.length]='\0';
-    return extr;
-}
-
-// compares two strings, NullPtr-friendly
-bool StringFragment_compare(StringFragment str0, StringFragment str1){
-    if(str0.length!=str1.length) return false;
-    if(!str0.ptr) return str1.ptr ? false : true;
-    else if(!str1.ptr) return false;
-    str0.ptr+=str0.offset;
-    str1.ptr+=str1.offset;
-    while(str0.length-->0)
-        if(*str0.ptr++ != *str1.ptr++) 
-            return false;
-    return true;
-}
-
-// creates new StringFragment which is reversed variant of <s>
-StringFragment StringFragment_reverse(StringFragment s){
-    if(s.length==0) return s;
-    StringFragment r={
-        .offset=0,
-        .length=s.length,
-        .ptr=malloc(s.length)
-    };
-    for(uint32 i=0; i<s.length; i++)
-        r.ptr[i+s.offset]=s.ptr[s.length-i-1];
-    return r;
-}
diff --git a/StringFragment/StringFragment.h b/StringFragment/StringFragment.h
deleted file mode 100644
index 9331413..0000000
--- a/StringFragment/StringFragment.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#pragma once
-
-#if __cplusplus
-extern "C" {
-#endif
-
-#include "../base/base.h"
-
-// part of string
-typedef struct StringFragment{
-    char* ptr; // may be without '\0' at the end
-    uint32 offset;
-    uint32 length;
-} StringFragment;
-
-static const StringFragment stringNull={NULL,0,0};
-
-// copies <length> characters from <ptr+offset> to new StringFragment (adding '\0' at the end)
-StringFragment StringFragment_extract(StringFragment str);
-
-// compares two strings, NullPtr-friendly
-bool StringFragment_compare(StringFragment str0, StringFragment str1);
-
-// creates new StringFragment which is reversed variant of <s>
-StringFragment StringFragment_reverse(StringFragment s);
-
-#if __cplusplus
-}
-#endif
\ No newline at end of file
diff --git a/base/base.h b/base/base.h
index ff07fdd..ad651e6 100644
--- a/base/base.h
+++ b/base/base.h
@@ -10,7 +10,7 @@ extern "C" {
 #include "mystr.h"
 
 // executes codeblock and prints execution time
-#ifdef CLOCK_REALTIME // non-standard high-precision clock
+#ifdef CLOCK_REALTIME //non-standard high-precision clock
     #define optime(opname,repeats,codeblock) ({\
         struct timespec start, stop;\
         clock_gettime(CLOCK_REALTIME, &start);\
@@ -20,7 +20,7 @@ extern "C" {
         double t=(double)(stop.tv_sec-start.tv_sec+(double)(stop.tv_nsec-start.tv_nsec)/1000000000)/repeats;\
         printf("\e[93moperation \e[94m%s\e[93m lasted \e[94m%lf \e[93mseconds\n",opname,t);\
     })
-#else // standard clock which works worse then previous
+#else //
     #define optime(opname,repeats,codeblock) ({\
         clock_t start=clock();\
         for(uint64 ___OPREP=0;___OPREP<(uint64)repeats;___OPREP++)\
diff --git a/base/cptr.c b/base/cptr.c
deleted file mode 100644
index 50dbcdf..0000000
--- a/base/cptr.c
+++ /dev/null
@@ -1,36 +0,0 @@
-#include "base.h"
-
-// returns length of string (without \0)
-uint32 cptr_length(char* str){
-    uint32 len=0;
-    while(*(str++)) len++;
-    return len;
-}
-
-// allocates new char[] and copies src there
-char* cptr_copy(char* src){
-    uint32 len=cptr_length(src)+1;
-    char* dst=malloc(len);
-    while(len-->0)
-        dst[len]=src[len];
-    return dst;
-}
-
-// compares two char buffers, NullPtr-friendly
-bool cptr_compare(char* key0, char* key1){
-    if(!key0) return key1 ? false : true;
-    if(!key1) return false;
-    while(*key0&&*key1)
-        if(*key0++ != *key1++) 
-            return false;
-    return true;
-}
-
-// multiplies char n times
-char* char_multiply(char c, uint32 n){
-    char* rez=malloc(n+1);
-    rez[n]=0;
-    while(n-->0)
-        rez[n]=c;
-    return rez;
-}
\ No newline at end of file
diff --git a/base/cptr.h b/base/cptr.h
deleted file mode 100644
index 93829fc..0000000
--- a/base/cptr.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#pragma once
-
-#if __cplusplus
-extern "C" {
-#endif
-
-#include "types.h"
-
-// returns length of string (without \0)
-uint32 cptr_length(char* str);
-
-// allocates new char[] and copies src there
-char* cptr_copy(char* src);
-
-// compares two char buffers, NullPtr-friendly
-bool cptr_compare(char* key0, char* key1);
-
-// multiplies char n times
-char* char_multiply(char c, uint32 n);
-
-#if __cplusplus
-}
-#endif
\ No newline at end of file
diff --git a/base/errors.c b/base/errors.c
index 13f6528..d10d5d1 100644
--- a/base/errors.c
+++ b/base/errors.c
@@ -1,7 +1,8 @@
 #include "std.h"
 #include "errors.h"
+#include "mystr.h"
 
-const char* errname(err_t err){
+char* errname(err_t err){
     switch(err){
         case SUCCESS: return "SUCCESS";
         case ERR_MAXLENGTH: return "ERR_MAXLENGTH";
@@ -14,14 +15,37 @@ const char* errname(err_t err){
     }
 }
 
-void _throwint(int err, const char* srcfile, int line, const char* funcname){
-    if(err){ // SUCCESS=0 is not an error
-        printf("\e[91m[%s:%d %s] throwed error: %s\e[0m\n",srcfile,line,funcname,errname(err));
-        exit(err); 
-    }
-    else printf("\e[93m[%s:%d %s] throwed SUCCESS as an error",srcfile,line,funcname);
+#define ERRMSG_MAXLENGTH 1024
+
+char* __genErrMsg(const char* errmsg, const char* srcfile, int line, const char* funcname){
+    size_t bufsize=ERRMSG_MAXLENGTH;
+    char* rezult=malloc(bufsize);
+    IFWIN(
+        sprintf_s(rezult,bufsize,"[%s:%d] %s() throwed error: %s",srcfile,line,funcname,errmsg),
+        sprintf(rezult,"[%s:%d] %s() throwed error: %s",srcfile,line,funcname,errmsg)
+    );
+    return rezult;
 }
-void _throwstr(const char* errmesg, const char* srcfile, int line, const char* funcname){
-    printf("\e[91m[%s:%d %s] throwed error: %s\e[0m\n",srcfile,line,funcname,errmesg);
-    exit(255); 
-}
\ No newline at end of file
+
+char* __extendErrMsg(const char* errmsg, const char* srcfile, int line, const char* funcname){
+    size_t bufsize=cptr_length(errmsg)+ERRMSG_MAXLENGTH;
+    char* rezult=malloc(bufsize);
+    IFWIN(
+        sprintf_s(rezult,bufsize,"%s\n \\___[%s:%d] %s()",errmsg,srcfile,line,funcname),
+        sprintf(rezult,"%s\n \\___[%s:%d] %s()",errmsg,srcfile,line,funcname)
+    );
+    free(errmsg);
+    return rezult;
+}
+
+void Maybe_free(Maybe e){
+    free(e.errmsg);
+    Unitype_free(e.value);
+}
+void printMaybe(Maybe e){
+    if(e.errmsg) printf("%s\n",e.errmsg);
+    else printuni(e.value);
+}
+
+char* __doNothing(char* a) {return a;}
+char* __unknownErr() {return "UNKNOWN ERROR";}
\ No newline at end of file
diff --git a/base/errors.h b/base/errors.h
index f1de875..88f63b0 100644
--- a/base/errors.h
+++ b/base/errors.h
@@ -4,20 +4,58 @@
 extern "C" {
 #endif
 
+#include "std.h"
+#include "types.h"
+
 typedef enum err_t {
-    SUCCESS, // not an error 
+    SUCCESS, //not an error 
     ERR_MAXLENGTH, ERR_WRONGTYPE, ERR_WRONGINDEX, ERR_NOTIMPLEMENTED, ERR_NULLPTR, ERR_ENDOFSTR
 } err_t;
 
-const char* errname(err_t err);
+char* errname(err_t err);
 
-void _throwint(int err, const char* srcfile, int line, const char* funcname) ;
-void _throwstr(const char* errmesg, const char* srcfile, int line, const char* funcname);
-#pragma GCC diagnostic ignored "-Wint-conversion"
-#define throw(E) \
-    CHOOSE(IFTYPE(E,int), _throwint(E,__FILE__,__LINE__,__func__), \
-    CHOOSE(IFTYPE(E,char[]), _throwstr(E,__FILE__,__LINE__,__func__), \
-    printf("\e[31m[%s:%d/%s] UNKNOWN ERROR\n",__FILE__,__LINE__,__func__)))
+char* __genErrMsg(const char* errmsg, const char* srcfile, int line, const char* funcname);
+char* __extendErrMsg(const char* errmsg, const char* srcfile, int line, const char* funcname);
+
+typedef struct Maybe{
+    Unitype value;
+    char* errmsg;
+} Maybe;
+static const Maybe MaybeNull={.value.type=Null, .value.VoidPtr=NULL,.errmsg=NULL};
+
+void Maybe_free(Maybe e);
+void printMaybe(Maybe e);
+
+
+#define SUCCESS(REZLT) (Maybe){.errmsg=NULL, .value=REZLT}
+
+#define __RETURN_EXCEPTION(ERRMSG) return (Maybe){.errmsg=ERRMSG, .value=UniNull}
+
+#define __EXIT(ERRMSG) ({ printf("\e[91m%s\e[0m \n", ERRMSG); exit(128); })
+
+char* __doNothing(char* a);
+char* __unknownErr( );
+
+#define __stringify_err(E) _Generic(\
+    (E),\
+    char*: __doNothing,\
+    int: errname,\
+    default: __unknownErr\
+)(E)
+
+#define throw(E) __EXIT(((char*)__genErrMsg((__stringify_err(E)), __FILE__,__LINE__,__func__)))
+#define safethrow(E) __RETURN_EXCEPTION(((char*)__genErrMsg((__stringify_err(E)), __FILE__,__LINE__,__func__)))
+
+
+#define try(_funcCall, _rezult) Maybe _rezult=_funcCall; if(_rezult.errmsg){\
+        _rezult.errmsg=__extendErrMsg(_rezult.errmsg, __FILE__,__LINE__,__func__);\
+        return _rezult;\
+    }else 
+
+#define tryLast(_funcCall, _rezult) Maybe _rezult=_funcCall; if(_rezult.errmsg){\
+        _rezult.errmsg=__extendErrMsg(_rezult.errmsg, __FILE__,__LINE__,__func__);\
+        __EXIT(_rezult.errmsg);\
+    }else 
 
 #if __cplusplus
 }
diff --git a/base/mystr.c b/base/mystr.c
index ad498a7..5503b46 100644
--- a/base/mystr.c
+++ b/base/mystr.c
@@ -37,8 +37,8 @@ char* char_multiply(char c, uint32 n){
 
 //copies str content to new char pointer value (adding '\0' at the end)
 char* string_cpToCptr(string str){
-    char* cptr=malloc(str.length*sizeof(char)+1);
     if(str.length==0) return NULL;
+    char* cptr=malloc(str.length*sizeof(char)+1);
     cptr[str.length]=0;
     while(str.length-->0)
         cptr[str.length]=str.ptr[str.length];
@@ -69,6 +69,7 @@ bool string_compare(string str0, string str1){
 
 //creates new string which is reversed variant of <s>
 string string_reverse(string s){
+    if(s.length==0) return s;
     string r={malloc(s.length), s.length};
     for(uint32 i=0; i<s.length; i++)
         r.ptr[i]=s.ptr[s.length-i-1];
diff --git a/base/std.h b/base/std.h
index dc5641f..a2415d2 100644
--- a/base/std.h
+++ b/base/std.h
@@ -10,6 +10,7 @@ extern "C" {
 #include <stdbool.h>
 #include <locale.h>
 #include <time.h>
+#include <setjmp.h>
 
 #define CHOOSE(B, Y, N) __builtin_choose_expr(B, Y, N)
 
diff --git a/base/types.c b/base/types.c
index bcd2bf2..f0197c7 100644
--- a/base/types.c
+++ b/base/types.c
@@ -45,7 +45,7 @@ const char* my_type_name(my_type t){
     }
 }
 
-// frees VoidPtr value or does nothing if type isn't pointer
+//frees VoidPtr value or does nothing if type isn't pointer
 void Unitype_free(Unitype u){
     switch (u.type) {
         case Null: 
@@ -115,16 +115,33 @@ void Unitype_free(Unitype u){
     }
 }
 
+#define SPRINT_BUFSIZE 64
+void sprintuni(char* buf,Unitype v){
+    IFWIN(
+        switch (v.type) {
+            case Null: sprintf_s(buf, SPRINT_BUFSIZE, "{Null}");break;
+            case Float64: sprintf_s(buf, SPRINT_BUFSIZE, "{%s : %lf}", my_type_name(v.type),v.Float64);break;
+            case Bool:
+            case UInt64: sprintf_s(buf, SPRINT_BUFSIZE, "{%s : %lu}", my_type_name(v.type),v.UInt64);break;
+            case Int64: sprintf_s(buf, SPRINT_BUFSIZE, "{%s : %ld}", my_type_name(v.type),v.Int64);break;
+            case CharPtr: sprintf_s(buf, SPRINT_BUFSIZE, "{%s : \"%s\"}", my_type_name(v.type),(char*)v.VoidPtr);break;
+            default: sprintf_s(buf, SPRINT_BUFSIZE, "{%s : %p}", my_type_name(v.type),v.VoidPtr);break;
+        },
+        switch (v.type) {
+            case Null: sprintf(buf, "{Null}");break;
+            case Float64: sprintf(buf, "{%s : %lf}", my_type_name(v.type),v.Float64);break;
+            case Bool:
+            case UInt64: sprintf(buf, "{%s : %lu}", my_type_name(v.type),v.UInt64);break;
+            case Int64: sprintf(buf, "{%s : %ld}", my_type_name(v.type),v.Int64);break;
+            case CharPtr: sprintf(buf, "{%s : \"%s\"}", my_type_name(v.type),(char*)v.VoidPtr);break;
+            default: sprintf(buf, "{%s : %p}", my_type_name(v.type),v.VoidPtr);break;
+        }
+    );
+}
 
 void printuni(Unitype v){
-    switch (v.type) {
-        case Null: printf("{Null}");break;
-        case Float64: printf("{%s : %lf}",my_type_name(v.type),v.Float64);break;
-        case Char: printf("{%s : '%c'}",my_type_name(v.type),v.Char);break;
-        case Bool:
-        case UInt64: printf("{%s : %lu}",my_type_name(v.type),v.UInt64);break;
-        case Int64: printf("{%s : %ld}",my_type_name(v.type),v.Int64);break;
-        case CharPtr: printf("{%s : \"%s\"}",my_type_name(v.type),(char*)v.VoidPtr);break;
-        default: printf("{%s : %p}",my_type_name(v.type),v.VoidPtr);break;
-    }
-}
+    char* s=malloc(SPRINT_BUFSIZE);
+    sprintuni(s,v);
+    fputs(s, stdout);
+    free(s);
+}
\ No newline at end of file
diff --git a/base/types.h b/base/types.h
index 58418e8..bbbf2f6 100644
--- a/base/types.h
+++ b/base/types.h
@@ -34,7 +34,6 @@ typedef struct Unitype{
         int64 Int64;
         uint64 UInt64;
         double Float64;
-        char Char;
         bool Bool;
         void* VoidPtr;
     };
@@ -48,9 +47,10 @@ static const Unitype UniFalse={.Bool=false,.type=Bool};
 #define Uni(TYPE,VAL) (Unitype){.type=TYPE,.TYPE=VAL}
 #define UniPtr(TYPE,VAL) (Unitype){.type=TYPE,.VoidPtr=VAL}
 
-// frees VoidPtr value or does nothing if type isn't pointer
+//frees VoidPtr value or does nothing if type isn't pointer
 void Unitype_free(Unitype u);
 void printuni(Unitype v);
+void sprintuni(char* s, Unitype v);
 
 #if __cplusplus
 }
diff --git a/kerep.vcxproj b/kerep.vcxproj
index 95978ba..5ed9303 100644
--- a/kerep.vcxproj
+++ b/kerep.vcxproj
@@ -75,27 +75,27 @@
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <OutDir>bin-$(Platform)\$(Configuration)\</OutDir>
-    <IntDir>obj-$(Platform)\$(Configuration)\</IntDir>
+    <OutDir>bin\$(Configuration)-$(Platform)\</OutDir>
+    <IntDir>obj\$(Configuration)-$(Platform)\</IntDir>
     <RunCodeAnalysis>true</RunCodeAnalysis>
     <ManagedAssembly>false</ManagedAssembly>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <OutDir>bin-$(Platform)\$(Configuration)\</OutDir>
-    <IntDir>obj-$(Platform)\$(Configuration)\</IntDir>
+    <OutDir>bin\$(Configuration)-$(Platform)\</OutDir>
+    <IntDir>obj\$(Configuration)-$(Platform)\</IntDir>
     <RunCodeAnalysis>true</RunCodeAnalysis>
     <ManagedAssembly>false</ManagedAssembly>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <RunCodeAnalysis>true</RunCodeAnalysis>
-    <OutDir>bin-$(Platform)\$(Configuration)\</OutDir>
-    <IntDir>obj-$(Platform)\$(Configuration)\</IntDir>
+    <OutDir>bin\$(Configuration)-$(Platform)\</OutDir>
+    <IntDir>obj\$(Configuration)-$(Platform)\</IntDir>
     <ManagedAssembly>false</ManagedAssembly>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <RunCodeAnalysis>true</RunCodeAnalysis>
-    <OutDir>bin-$(Platform)\$(Configuration)\</OutDir>
-    <IntDir>obj-$(Platform)\$(Configuration)\</IntDir>
+    <OutDir>bin\$(Configuration)-$(Platform)\</OutDir>
+    <IntDir>obj\$(Configuration)-$(Platform)\</IntDir>
     <ManagedAssembly>false</ManagedAssembly>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
@@ -204,9 +204,10 @@
     <ClInclude Include="Autoarr\Autoarr.h" />
     <ClInclude Include="Autoarr\Autoarr_declare.h" />
     <ClInclude Include="Autoarr\Autoarr_define.h" />
+    <ClInclude Include="Autoarr\StringBuilder.h" />
     <ClInclude Include="base\base.h" />
-    <ClInclude Include="base\cptr.h" />
     <ClInclude Include="base\errors.h" />
+    <ClInclude Include="base\mystr.h" />
     <ClInclude Include="base\std.h" />
     <ClInclude Include="base\types.h" />
     <ClInclude Include="DtsodParser\DtsodV24.h" />
@@ -214,17 +215,16 @@
     <ClInclude Include="Hashtable\Hashtable.h" />
     <ClInclude Include="Hashtable\KeyValuePair.h" />
     <ClInclude Include="SearchTree\SearchTree.h" />
-    <ClInclude Include="StringFragment\StringBuilder.h" />
-    <ClInclude Include="StringFragment\StringFragment.h" />
     <ClInclude Include="tests\tests.h" />
     <ClInclude Include="tests\test_marshalling.h" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="Autoarr\Autoarr.c" />
-    <ClCompile Include="Autoarr\StringBuilder.c" />
     <ClCompile Include="Autoarr\Autoarr_KVPair_exported.c" />
     <ClCompile Include="Autoarr\Autoarr_Unitype_exported.c" />
+    <ClCompile Include="Autoarr\StringBuilder.c" />
     <ClCompile Include="base\errors.c" />
+    <ClCompile Include="base\mystr.c" />
     <ClCompile Include="base\types.c" />
     <ClCompile Include="DtsodParser\DtsodV24.c" />
     <ClCompile Include="DtsodParser\DtsodV24_deserialize.c" />
@@ -234,13 +234,12 @@
     <ClCompile Include="Hashtable\Hashtable.c" />
     <ClCompile Include="Hashtable\KeyValuePair.c" />
     <ClCompile Include="SearchTree\SearchTree.c" />
-    <ClCompile Include="StringFragment\StringBuilder.c" />
-    <ClCompile Include="StringFragment\StringFragment.c" />
     <ClCompile Include="tests\main.c" />
     <ClCompile Include="tests\test_autoarr.c" />
     <ClCompile Include="tests\test_dtsod.c" />
     <ClCompile Include="tests\test_hashtable.c" />
     <ClCompile Include="tests\test_marshalling.c" />
+    <ClCompile Include="tests\test_safethrow.c" />
     <ClCompile Include="tests\test_searchtree.c" />
     <ClCompile Include="tests\test_string.c" />
   </ItemGroup>
diff --git a/kerep.vcxproj.filters b/kerep.vcxproj.filters
index 12a6e5c..802eb88 100644
--- a/kerep.vcxproj.filters
+++ b/kerep.vcxproj.filters
@@ -63,15 +63,6 @@
     <ClInclude Include="tests\tests.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
-    <ClInclude Include="base\cptr.h">
-      <Filter>Файлы заголовков</Filter>
-    </ClInclude>
-    <ClInclude Include="StringFragment\StringBuilder.h">
-      <Filter>Файлы заголовков</Filter>
-    </ClInclude>
-    <ClInclude Include="StringFragment\StringFragment.h">
-      <Filter>Файлы заголовков</Filter>
-    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="Autoarr\Autoarr.c">
diff --git a/tests/main.c b/tests/main.c
index 47445cc..4b3149d 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -1,10 +1,11 @@
 #include "tests.h"
 
 void test_all(){
-    test_searchtree();
     test_autoarr();
-    test_hashtable();
     test_string();
+    test_safethrow();
+    test_searchtree();
+    test_hashtable();
     test_dtsod();
     printf("\e[96m---------------------------------------\e[0m\n");
 }
diff --git a/tests/test_dtsod.c b/tests/test_dtsod.c
index 6b4ae69..5b82206 100644
--- a/tests/test_dtsod.c
+++ b/tests/test_dtsod.c
@@ -4,12 +4,11 @@
 const char text[]=
 "message: {\n"
 "    bool: false;"
-"    char: 'v';"
 "    int: -2515;"
 "    uint:#comment!\n 0u;"
 "    double: 965.557f;#another comment!\n"
 "    text: \"_$\\\"\\\\'''a ыыы000;2;=:%d;```\";\n"
-"}; ";
+"};";
 
 void print_dtsod(Hashtable* dtsod){
     printf("\e[92m");
@@ -33,18 +32,21 @@ void test_dtsod(){
     optime(__func__,1,({
         printf("\e[96m-------------[test_dtsod]-------------\n");
         Hashtable* dtsod;
-        char* s=cptr_copy(text);
 
-        optime("deserialize",1,(dtsod=DtsodV24_deserialize(s)));
-        free(s);
+        optime("deserialize",1,({
+            tryLast(DtsodV24_deserialize(text),r) 
+                dtsod=r.value.VoidPtr;
+        }));
         print_dtsod(dtsod);
 
+        char* s;
         optime("serialize",1,(s=DtsodV24_serialize(dtsod)));
         Hashtable_free(dtsod);
         printf("\e[92m%s",s);
 
         optime("reserialize",10,({
-            dtsod=DtsodV24_deserialize(s);
+            tryLast(DtsodV24_deserialize(s),r) 
+                dtsod=r.value.VoidPtr;
             free(s);
             s=DtsodV24_serialize(dtsod);
             Hashtable_free(dtsod);
diff --git a/tests/test_hashtable.c b/tests/test_hashtable.c
index 6a6f5c3..70e7944 100644
--- a/tests/test_hashtable.c
+++ b/tests/test_hashtable.c
@@ -39,7 +39,10 @@ void printrowgraph(Hashtable* ht){
 void fill(Hashtable* ht){
     for(uint32 i=0;i<100000;i++){
         char* key=malloc(12);
-        sprintf(key,"key__%u",i);
+        IFWIN(
+            sprintf_s(key,12,"key_%u",i),
+            sprintf(key,"key_%u",i)
+        );
         Hashtable_add(ht,key,Uni(UInt64,i));
     }
 }
@@ -48,7 +51,10 @@ Unitype gett(Hashtable* ht){
     char* key=malloc(12);
     Unitype u;
     for(uint32 i=0;i<100000;i++){
-        sprintf(key,"key__%u",i);
+        IFWIN(
+            sprintf_s(key,12,"key_%u",i),
+            sprintf(key,"key_%u",i)
+        );
         u=Hashtable_get(ht,key);
     }
     free(key);
diff --git a/tests/test_safethrow.c b/tests/test_safethrow.c
new file mode 100644
index 0000000..78c6a1c
--- /dev/null
+++ b/tests/test_safethrow.c
@@ -0,0 +1,43 @@
+#include "tests.h"
+
+Maybe dont_throw(){
+    return SUCCESS(Uni(UInt64, 9/2));
+}
+
+Maybe throw_error(){
+    safethrow("test exception");
+}
+
+Maybe throw_errcode(){
+    safethrow(ERR_NULLPTR);
+}
+
+Maybe test_maybe(){
+    printf("\e[94mdont_throw returns \e[92m");
+    tryLast(dont_throw(),rez0)
+        printMaybe(rez0);
+    printf("\n");
+    try(throw_error(),rez1)
+        printMaybe(rez1);
+    throw("test_maybe failed");
+    return MaybeNull;
+}
+
+
+Maybe c(){ try(throw_errcode(),_) return MaybeNull; }
+Maybe b(){ try(c(),_) return MaybeNull; }
+Maybe a(){ try(b(),_) return MaybeNull; }
+
+void test_safethrow(){
+    printf("\e[96m-----------[test_safethrow]-----------\n");
+    optime("test_safethrow", 1, ({
+        Maybe e=test_maybe();
+        printf("\e[94mthrow_error:\n\e[92m");
+        printMaybe(e);
+        Maybe_free(e);
+        printf("\e[94mthrow_errcode:\n\e[92m");
+        e=a();
+        printMaybe(e);
+        Maybe_free(e);
+    }));
+}
diff --git a/tests/test_string.c b/tests/test_string.c
index 6eef4c2..e9e249f 100644
--- a/tests/test_string.c
+++ b/tests/test_string.c
@@ -6,10 +6,10 @@ void test_string(){
         printf("\e[96m-------------[test_string]-------------\n");
         char c[]="0123456789abcdef";
         string s=string_cpFromCharPtr(c);
-        printf("\e[92m\"%s\" -> string_cpFromCharPtr()\n",c);
+        printf("\e[92m\"%s\" \e[94m-> string_cpFromCharPtr()\n",c);
         if(s.length!=16) throw("string created with incorrect length");
         char* p=string_cpToCptr(s);
-        printf("\e[92mstring_cpToCptr() -> \"%s\"\n",p);
+        printf("\e[94mstring_cpToCptr() -> \e[92m\"%s\"\n",p);
         free(p);
         free(s.ptr);
     }));
diff --git a/tests/tests.h b/tests/tests.h
index 220ac56..edaa49f 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -8,4 +8,5 @@ void test_searchtree();
 void test_autoarr();
 void test_hashtable();
 void test_string();
-void test_dtsod();
\ No newline at end of file
+void test_dtsod();
+void test_safethrow();
\ No newline at end of file