diff --git a/StringFragment/StringBuilder.c b/Autoarr/StringBuilder.c
similarity index 70%
rename from StringFragment/StringBuilder.c
rename to Autoarr/StringBuilder.c
index 4066c5a..6a12265 100644
--- a/StringFragment/StringBuilder.c
+++ b/Autoarr/StringBuilder.c
@@ -14,10 +14,11 @@ void StringBuilder_append_cptr(StringBuilder* b, char* s){
         Autoarr_add(b,c);
 }
 
-void StringBuilder_append_string(StringBuilder* b, StringFragment s){
-    s.ptr+=s.offset;
-    while(s.length-->0)
+void StringBuilder_append_string(StringBuilder* b, string s){
+    while(s.length>0){
         Autoarr_add(b,*s.ptr++);
+        s.length--;
+    }
 }
 
 void StringBuilder_append_int64(StringBuilder* b, int64 a){
@@ -35,7 +36,7 @@ void StringBuilder_append_int64(StringBuilder* b, int64 a){
         buf[i++]='0'+a%10;
         a/=10;
     }
-    StringFragment rev=StringFragment_reverse((StringFragment){buf,0,i});
+    string rev=string_reverse((string){buf,i});
     StringBuilder_append_string(b,rev);
     free(rev.ptr);
 }
@@ -51,7 +52,8 @@ void StringBuilder_append_uint64(StringBuilder* b, uint64 a){
         buf[i++]='0'+a%10;
         a/=10;
     }
-    StringFragment rev=StringFragment_reverse((StringFragment){buf,0,i});
+    string rev=string_reverse((string){buf,i});
+    printf("\e[95mrev:%s\n",string_cpToCptr(rev));
     StringBuilder_append_string(b,rev);
     free(rev.ptr);
 }
@@ -65,14 +67,11 @@ void StringBuilder_append_double(StringBuilder* b, double a){
     StringBuilder_append_cptr(b,buf);
 }
 
-StringFragment StringBuilder_build(StringBuilder* b){
-    StringFragment str={
-        .offset=0,
-        .length=Autoarr_length(b)
-    };
-    str.ptr=malloc(str.length+1);
-    for(uint32 i=0; i<str.length; i++)
-        str.ptr[i]=Autoarr_get(b,i);
-    str.ptr[str.length]='\0';
+char* StringBuilder_build(StringBuilder* b){
+    uint32 len=Autoarr_length(b);
+    char* str=malloc(len+1);
+    str[len]=0;
+    for(uint32 i=0;i<len;i++)
+        str[i]=Autoarr_get(b,i);
     return str;
 }
diff --git a/Autoarr/StringBuilder.h b/Autoarr/StringBuilder.h
new file mode 100644
index 0000000..0b52429
--- /dev/null
+++ b/Autoarr/StringBuilder.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#include "Autoarr.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, string 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);
+	char* StringBuilder_build(StringBuilder* b);
+
+#if __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/DtsodParser/DtsodV24_deserialize.c b/DtsodParser/DtsodV24_deserialize.c
index 980d4d2..2c04b9e 100644
--- a/DtsodParser/DtsodV24_deserialize.c
+++ b/DtsodParser/DtsodV24_deserialize.c
@@ -1,41 +1,23 @@
 #include "DtsodV24.h"
-#include "../StringFragment/StringBuilder.h"
+#include "../Autoarr/StringBuilder.h"
 
 #define ARR_BC 8
 #define ARR_BL 16
 #define STRB_BC 64
 #define STRB_BL 1024
 
-// special func for throwing error messages about wrong characters in deserializing text
-Maybe ERROR_WRONGCHAR(const char c, char* text, char* text_first, const char* srcfile, int line, const char* funcname){
-    char errBuf[33];
-    errBuf[32]='\0';
-    char* errText=text-16;
-    if(errText<text_first) errText=text_first;
-    for(uint8 i=0; i<32; i++){
+Maybe ERROR_WRONGCHAR(char c, char* text){
+    char errBuf[]="unexpected <c> at:\n  \""
+        "00000000000000000000000000000000\"";
+    errBuf[12]=c;
+    for(uint8 i=0; i<32; i++)
         // writes 16 chars before and 15 after the wrongchar
-        char _c=errText[i];
-        errBuf[i]=_c;
-        if(!_c) break;
-    }
-    char* errmsg=malloc(256);
-    IFWIN(
-        sprintf_s(errmsg,256, "unexpected <%c> at:\n"
-                        "  \"%s\"\n"
-                        "\\___[%s:%d] %s()", 
-                        c,errBuf, srcfile,line,funcname),
-        sprintf(errmsg, "unexpected <%c> at:\n"
-                        "  \"%s\"\n"
-                        " \\___[%s:%d] %s()", 
-                        c,errBuf, srcfile,line,funcname)
-    );
-    safethrow(cptr_copy(errmsg));
-}
-#define safethrow_wrongchar(C) return ERROR_WRONGCHAR(C, text, shared->sh_text_first, __FILE__,__LINE__,__func__)
+        errBuf[i+22]=*(text - 16 + i);
+    safethrow(cptr_copy(errBuf));
+#define safethrow_wrongchar(C) return ERROR_WRONGCHAR(C, text)
 
 
 typedef struct DeserializeSharedData{
-    const char* sh_text_first; 
     char* sh_text;
     bool sh_partOfDollarList;
     bool sh_readingList;
@@ -56,7 +38,7 @@ Maybe __SkipComment(DeserializeSharedData* shared) {
 
 Maybe __ReadName(DeserializeSharedData* shared){
     char c;
-    StringFragment nameStr={text,0};
+    string nameStr={text,0};
     text--;
     while ((c=*++text)) switch (c){
         case ' ':  case '\t':
@@ -82,7 +64,7 @@ Maybe __ReadName(DeserializeSharedData* shared){
             if((*++text)!=';')
                 safethrow_wrongchar(c);
         case ':':
-            return SUCCESS(UniPtr(CharPtr,StringFragment_extract(nameStr).ptr));
+            return SUCCESS(UniPtr(CharPtr,string_cpToCptr(nameStr)));
         case '$':
             if(nameStr.length!=0)
                 safethrow_wrongchar(c);
@@ -117,9 +99,9 @@ Maybe __ReadString(DeserializeSharedData* shared){
                 StringBuilder_append_char(b,c);
             }
             else {
-                StringFragment str=StringBuilder_build(b);
+                char* str=StringBuilder_build(b);
                 Autoarr_clear(b);
-                return SUCCESS(UniPtr(CharPtr,str.ptr));
+                return SUCCESS(UniPtr(CharPtr,str));
             }
         } 
         else {
@@ -144,6 +126,7 @@ Maybe __ReadList(DeserializeSharedData* shared){
 };
 #define ReadList() __ReadList(shared)
 
+<<<<<<< HEAD
 Maybe __ParseValue(DeserializeSharedData* shared, StringFragment str){
     // printf("\e[94m<\e[96m%s\e[94m>\n",StringFragment_extract(str));
     const StringFragment trueStr= {"true" ,0,4};
@@ -152,10 +135,29 @@ Maybe __ParseValue(DeserializeSharedData* shared, StringFragment str){
         // Bool
         case 'e': {
             if(StringFragment_compare(str,trueStr))
+=======
+Maybe __ParseValue(DeserializeSharedData* shared, string str){
+    //printf("\e[94m<\e[96m%s\e[94m>\n",string_cpToCptr(str));
+    const string nullStr={"null",4};
+    const string trueStr={"true",4};
+    const string falseStr={"false",5};
+    switch(*str.ptr){
+        case 'n':
+            if(string_compare(str,nullStr))
+                return SUCCESS(UniNull);
+            else safethrow_wrongchar(*str.ptr);
+            break;
+        case 't':
+            if(string_compare(str,trueStr))
+>>>>>>> parent of 41f32f4 (string -> StringFragment, throw_wrongchar() fixed)
                 return SUCCESS(UniTrue);
-            else if(StringFragment_compare(str,falseStr))
+            else safethrow_wrongchar(*str.ptr);
+            break;
+        case 'f':
+            if(string_compare(str,falseStr))
                 return SUCCESS(UniFalse);
             else safethrow_wrongchar(*str.ptr);
+<<<<<<< HEAD
         }
         // Float64
         case 'f': {
@@ -191,15 +193,50 @@ Maybe __ParseValue(DeserializeSharedData* shared, StringFragment str){
         // unknown type
         default:
             safethrow_wrongchar(str.ptr[str.length-1]);
+=======
+            break;
+        default: 
+            switch(str.ptr[str.length-1]){
+                case 'f': {
+                        char* _c=string_cpToCptr(str);
+                        Unitype rez=Uni(Float64,strtod(_c,NULL));
+                        free(_c);
+                        return SUCCESS(rez);
+                    }
+                case 'u': {
+                        uint64 lu=0;
+                        char* _c=string_cpToCptr(str);
+                        sscanf(_c,"%lu",&lu);
+                        free(_c);
+                        return SUCCESS(Uni(UInt64,lu));
+                    }
+                case '0': case '1': case '2': case '3': case '4':
+                case '5': case '6': case '7': case '8': case '9': {
+                        int64 li=0;
+                        char* _c=string_cpToCptr(str);
+                        if(sscanf(_c,"%li",&li)!=1){
+                            char err[64];
+                            IFWIN(
+                                sprintf_s(err,64,"can't parse to int: <%s>",_c),
+                                sprintf(err,"can't parse to int: <%s>",_c)
+                            );
+                            safethrow(err);
+                        }
+                        free(_c);
+                        return SUCCESS(Uni(Int64,li));
+                    }
+                default:
+                    safethrow_wrongchar(str.ptr[str.length-1]);
+            }
+>>>>>>> parent of 41f32f4 (string -> StringFragment, throw_wrongchar() fixed)
     }
-    
     safethrow(ERR_ENDOFSTR);
 };
 #define ParseValue(str) __ParseValue(shared, str)
 
 Maybe __ReadValue(DeserializeSharedData* shared){
     char c;
-    StringFragment valueStr={text+1,0};
+    string valueStr={text+1,0};
     Unitype value;
     while ((c=*++text)) switch (c){
         case ' ':  case '\t':
@@ -255,7 +292,6 @@ Maybe __ReadValue(DeserializeSharedData* shared){
 
 Maybe __deserialize(char** _text, bool _calledRecursively) {
     DeserializeSharedData _shared={
-        .sh_text_first=*_text,
         .sh_text=*_text,
         .sh_partOfDollarList=false,
         .sh_readingList=false,
diff --git a/DtsodParser/DtsodV24_serialize.c b/DtsodParser/DtsodV24_serialize.c
index fcc612d..0847646 100644
--- a/DtsodParser/DtsodV24_serialize.c
+++ b/DtsodParser/DtsodV24_serialize.c
@@ -1,5 +1,5 @@
 #include "DtsodV24.h"
-#include "../StringFragment/StringBuilder.h"
+#include "../Autoarr/StringBuilder.h"
 
 // 65536 max length!
 #define STRB_BC 64
@@ -51,7 +51,8 @@ void __AppendValue(SerializeSharedData* shared, Unitype u){
                 StringBuilder_append_cptr(b, u.Bool ? "true" : "false");
                 break;
             case Null:
-                throw("Null isn't supported in DtsodV24");
+                if(!u.VoidPtr) StringBuilder_append_cptr(b, "null");
+                else throw("Null-type pointer is not 0");
                 break;
             case AutoarrUnitypePtr:
                 addc('[');
@@ -96,7 +97,7 @@ void __serialize(StringBuilder* _b, uint8 _tabs, Hashtable* dtsod){
 char* DtsodV24_serialize(Hashtable* dtsod){
     StringBuilder sb=StringBuilder_create(STRB_BC,STRB_BL);
     __serialize(&sb,0,dtsod);
-    StringFragment str=StringBuilder_build(&sb);
+    char* str=StringBuilder_build(&sb);
     Autoarr_clear((&sb));
-    return str.ptr;
+    return str;
 }
diff --git a/base/base.h b/base/base.h
index 4e2708e..ff07fdd 100644
--- a/base/base.h
+++ b/base/base.h
@@ -7,7 +7,7 @@ extern "C" {
 #include "std.h"
 #include "types.h"
 #include "errors.h"
-#include "cptr.h"
+#include "mystr.h"
 
 // executes codeblock and prints execution time
 #ifdef CLOCK_REALTIME // non-standard high-precision clock
diff --git a/base/errors.c b/base/errors.c
index f56687a..d10d5d1 100644
--- a/base/errors.c
+++ b/base/errors.c
@@ -1,6 +1,6 @@
 #include "std.h"
 #include "errors.h"
-#include "cptr.h"
+#include "mystr.h"
 
 char* errname(err_t err){
     switch(err){
diff --git a/base/mystr.c b/base/mystr.c
new file mode 100644
index 0000000..5503b46
--- /dev/null
+++ b/base/mystr.c
@@ -0,0 +1,77 @@
+#include "base.h"
+
+//returns length of string (including \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);
+    char* dst=malloc(len*sizeof(char));
+    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;
+}
+
+//copies str content to new char pointer value (adding '\0' at the end)
+char* string_cpToCptr(string str){
+    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];
+    return cptr;
+}
+
+//copies cptr content (excluding '\0' at the end) to new string
+string string_cpFromCharPtr(char* cptr){
+    if(!cptr) return stringNull;
+    string str;
+    str.length=cptr_length(cptr)-1;
+    str.ptr=malloc(str.length);
+    for(uint32 i=0;i<str.length;i++)
+        str.ptr[i]=cptr[i];
+    return str;
+}
+
+//compares two strings, NullPtr-friendly
+bool string_compare(string str0, string str1){
+    if(str0.length!=str1.length) return false;
+    if(!str0.ptr) return str1.ptr ? false : true;
+    else if(!str1.ptr) return false;
+    while(str0.length-->0)
+        if(*str0.ptr++ != *str1.ptr++) 
+            return false;
+    return true;
+}
+
+//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];
+    return r;
+}
diff --git a/base/mystr.h b/base/mystr.h
new file mode 100644
index 0000000..fa95fd8
--- /dev/null
+++ b/base/mystr.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#include "types.h"
+
+//returns length of string (including \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);
+
+//my fixed length string struct
+//doesn't store '\0' at the end
+typedef struct string{
+    char* ptr;      //char pointer
+    uint32 length;  //amount of chars in ptr value
+} string;
+
+static const string stringNull={NULL,0};
+
+//copies str content to new char pointer value (adding '\0' at the end)
+char* string_cpToCptr(string str);
+
+//copies cptr content (excluding '\0' at the end) to new string
+string string_cpFromCharPtr(char* cptr);
+
+//compares two strings, NullPtr-friendly
+bool string_compare(string str0, string str1);
+
+//creates new string which is reversed variant of <s>
+string string_reverse(string s);
+
+#if __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/tests/main.c b/tests/main.c
index 6b3b54b..4b3149d 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -13,7 +13,7 @@ void test_all(){
 int main(){
     setlocale(LC_ALL, "en-US.Unicode");
     printf("\e[92mdtsod parser in c language!\e[97m\n");
-    optime("test_all",1,test_all());
+    optime("test_all",1,{test_all();});
     printf("\e[0m\n");
     return 0;
 }
diff --git a/tests/test_string.c b/tests/test_string.c
index 5783047..e9e249f 100644
--- a/tests/test_string.c
+++ b/tests/test_string.c
@@ -1,26 +1,16 @@
 #include "tests.h"
-#include "../StringFragment/StringFragment.h"
+#include "../base/mystr.h"
 
 void test_string(){
     optime(__func__,1,({
         printf("\e[96m-------------[test_string]-------------\n");
         char c[]="0123456789abcdef";
-
-        StringFragment s={.ptr=cptr_copy(c),.offset=0,.length=cptr_length(c)};
-        printf("\e[92m\"%s\" \e[94m-> StringFragment\n",c);
-        if(s.length!=16) throw("StringFragment created with incorrect length");
-
-        StringFragment extr=StringFragment_extract(s);
-        printf("\e[94mStringFragment_extract() -> \e[92m\"%s\"\n",extr.ptr);
-        if(extr.length!=16) throw("StringFragment extracted with incorrect length");
-        free(extr.ptr);
-
-        s.offset+=2; s.length-=4;
-        printf("\e[94mStringFragment offset+=2 length-=4\n");
-        extr=StringFragment_extract(s);
-        printf("\e[94mStringFragment_extract() ->   \e[92m\"%s\"\n",extr.ptr);
-        if(extr.length!=12) throw("StringFragment extracted with incorrect length");
+        string s=string_cpFromCharPtr(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[94mstring_cpToCptr() -> \e[92m\"%s\"\n",p);
+        free(p);
         free(s.ptr);
-        free(extr.ptr);
     }));
 }
\ No newline at end of file