删除子字符串

#include<stdio.h>
void del_substr(char *str, char *substr)
{
    int i=0;
    int j;
    int del_len = 0;
    while(str[i])
    {
        int tmp = i;
        int match_len = 0;
        for(j=0; substr[j]; ++j)
        {
            if(del_len > 0)
            {
                str[i] = str[i+del_len];
            }
            if(str[i] == substr[j])
            {
               ++i;
               ++match_len;
            }
            else
            {
                i = tmp + 1;
                break;
            }
        }
        if(substr[j] == '\0') //找到了串
        {
            del_len += match_len;
            i = tmp;
        }
    }
}
int main()
{
     char str[] = "aabbbbccbbddbb";
     char substr[] = "bb";
     del_substr(str, substr);
     printf("%s\n", str);
     return 0;
}