概述
#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<assert.h>
#include<stdlib.h>
char *my_strstr(char *dst, char *src)
{
assert(dst);
assert(src);
char *p = dst;
char *s1 = p;
char *s2 = src;
while (*s1)
{
s1 = p;
s2 = src;
while ((*s1!='