[C language] realize string interception function

1. Realization function ： Enter a string , And input the left matching string and the right matching string , Intercept 2 Middle character function .

2. Code ：

Action()
{
   char str[] = "http://www.runoob.com";
   char left_str[] = "http://";
   char right_str[] =".runoob.com";
   str_save_param(str,left_str,right_str);

   //lr_error_message(" The number of characters is - |%d|\n", countchar(right_str,right_str[0]));

 return 0;
}

void str_save_param(char * str,char left_str[],char right_str[]){
   char *ret;
   char *aaa;
   char str1[] = "";
   int left_str_len,right_str_len ;
   int i;

   left_str_len = strlen(left_str);
   right_str_len = countchar(right_str,right_str[0]);
   ret = (char*) strchr(str, left_str[0]);
   for (i=0;i<right_str_len;i++ ) {
       aaa = (char*) strrchr(str, right_str[0]);
       memset(str1,0,sizeof(str1) );
       sprintf(str1,"%s",aaa);
       ReplaceStr(str,str1,"");
   }
   
   //lr_error_message(" The string is - |%s|\n", aaa);

   strcpy(ret,ret+left_str_len);

   lr_error_message(" The string is - |%s|\n", str1);

   ReplaceStr(ret,str1,"");

   lr_error_message(" The string is - |%s|\n", ret);
}

int ReplaceStr(char* sSrc, char* sMatchStr, char* sReplaceStr)
{
        int StringLen;
        char caNewString[1024];
        char* findPos;
        merc_timer_handle_t timer_ReplaceStr = lr_start_timer();

        //lr_debug_message(LR_MSG_CLASS_EXTENDED_LOG ,"Notify:Function 'ReplaceStr' started.");
        findPos =(char *)strstr(sSrc, sMatchStr);
        if( (!findPos) || (!sMatchStr) ){
            //lr_debug_message(LR_MSG_CLASS_EXTENDED_LOG ,"Notify:Function 'ReplaceStr' ended with error!");
            return -1;
        }               

        while( findPos)
        {
                memset(caNewString, 0, sizeof(caNewString));
                StringLen = findPos - sSrc;
                strncpy(caNewString, sSrc, StringLen);
                strcat(caNewString, sReplaceStr);
                strcat(caNewString, findPos + strlen(sMatchStr));
                strcpy(sSrc, caNewString);

                findPos =(char *)strstr(sSrc, sMatchStr);
        }
        //lr_debug_message(LR_MSG_CLASS_EXTENDED_LOG,"Result:%s",sSrc);
        free(findPos);
        //lr_debug_message(LR_MSG_CLASS_EXTENDED_LOG ,"Notify:Function 'ReplaceStr' ended (Duration: %lf)",lr_end_timer(timer_ReplaceStr));
        return 0;
}

int countchar(char *str,char a){
    int n=0;
    int i = 0;
    while(*(str+i)!='\0'){
        if(*(str+i) == a)
            n++;
        i++;
    }
    return n;
}
 

3. Output ：

Starting action Action.

Action.c(20): Error: The string is - |.com|
Action.c(26): Error: The string is - |runoob.com|
Action.c(28): Error: The string is - ||
Action.c(32): Error: The string is - |runoob|