删除子字符串

#include <stdio.h>#include <string.h>int delete_sub_str(const char *str, const char *sub_str, char *result_str){        int count=0;        char *p1=str;        char *pos=strstr(str,sub_str);        while(pos!=NULL){                count++;                while(p1!=pos) *result_str++=*p1++;                p1+=strlen(sub_str);                pos=strstr(p1,sub_str);        }        while(*p1!='\0')        {                *result_str++=*p1++;        }        *result_str='\0';        return count;}int main(){        char *p1="mabcoabctyuabcq";        puts(p1);        char *sub="abc";        char res[20];        int a=delete_sub_str(p1,sub,res);        printf("res=%s and count=%d\n",res,a);        return 0;}