extractor

        returntype? extractor(?? )
        {
            char* a_ptr = strchr(const char* a,int c) + 1;
            char* b_ptr = strrchr(const char* b,int d);
            if (b_ptr == NULL)
            {
                error(400);
                continue;
            }
            int len = b_ptr - a_ptr;
            char array[req_tar_len + 1 ];
            strncpy(array,a_ptr,len);
            array[len] = '\0';
            return array;
        }