字符串中字符查询

//
//  main.c
//  9.16 exercise
//
//  Created by 毛遵杰 on 2019/9/16.
//  Copyright © 2019 毛遵杰. All rights reserved.
//

#include <stdio.h>
#include <stdlib.h>
char *find_char(const char * sourse,const char* string)
{
    char *sto;
    sto=(char*)malloc(sizeof(sto));
    sourse=sto;
    while(*sourse!=*string&&*sourse!='\0')
    {
        sourse++;
    }
    if(*sourse==*string)
        return sourse;
    else
        return NULL;
    
}
int main(void)
{
    char *p;
    p=(char *)malloc(sizeof(p));
    scanf("请输入%c\n",p);
    printf("用户输入的字符串是%c",*p);
    char *q;
    q=(char *)malloc(sizeof(q));
    scanf("请输入要查询的字符%c\n",q);
    printf("用户输入的字符是%c",*q);
   
    char *result=find_char(p,q);
    printf("%c",*result);
    free(p);
    free(q);
    return 0;
}