字符串练习——识别合法帧

输入一个字符串,同时输入帧头和帧尾(可以是多个字符),将该字符串中合法的帧识别出来。
提示：帧头和帧尾分别是head和tail 。字符串 ”asdheadhauboisoktail”中headhauboisoktail是合法帧

#include <stdio.h>#include <string.h>int fun(char *ptr,char *head,char *tail){char *temp;while(*ptr != '\0'){if(strncmp(ptr,head,strlen(head)) == 0){temp = ptr;ptr+=strlen(head);while(*ptr != '\0'){if(strncmp(ptr,tail,strlen(tail)) == 0){*(ptr+strlen(tail)) = '\0';  printf("%s\n",temp);return 0;       }ptr++;}printf("find head not find tail!\n");break;}elseptr++;}return 0;}int main(){ char src[100];char head[20];char tail[20];printf("please input string:\n");scanf("%s",src);printf("please input head:\n");scanf("%s",head);printf("please input tail:\n");scanf("%s",tail);printf("the result:\n");fun(src,head,tail);return 0;}