added path_getUserDir, dir_createParent

src/string/str.c

@@ -2,11 +2,10 @@
 #include "tlibc/string/StringBuilder.h"
 
 str str_copy(const str self){
-    if(self.data == NULL || self.len == 0)
-        return self;
-    
     str copy = str_construct((char*)malloc(self.len + 1), self.len, true);
-    memcpy(copy.data, self.data, self.len);
+    if(self.len != 0){
+        memcpy(copy.data, self.data, self.len);
+    }
     copy.data[copy.len] = '\0';
     return copy;
 }