写一个函数，输入一行字符，将此字符串中最长的单词输出。

#include <stdio.h>#include <windows.h>void put_longest_string(char *p){    char *p1 = p;    char *p2 = p;    char *ret = p;    int count1 = 0;    int count2 = 0;    while (*p2!='\0')    {        count1++;        if (*p2 == ' ')        {            *p2 = '\0';            p2++;               if (count2 < count1)            {                count2 = count1;                ret = p1;            }            p1 = p2;            count1 = 0;        }        else        {            p2++;        }    }    puts(ret);}int main(){    char ch[30] = { 0 };    gets(ch);    put_longest_string(ch);    system("pause");    return 0;}