笔试题 -- mystrrchr 字符串逆序查找字符

#include <stdio.h>
#include <string.h>
/*
   逆序查找字符串中字符
*/

char *mystrrchr(char *s,char c)
{
    char *p = s + strlen(s);
   do{
      if(*p == c)
         return p;
      
   }while(--p >= s);
   return NULL;
}

int main()
{
   char *src = "123456";
   char a = '8';
   
   char *tmp;
   tmp = mystrrchr(src,a);
   printf("tmp = %s\n",tmp);
   
   return 0;
}