#include <iostream>
#include <string.h>
using namespace std;

char* fun(char buf[], char lpb[]);
int main()
{
 
 char str1[] = "Borland International", str2[] = "nation";
 char *test = fun(str1, str2);
 if(NULL == test) return -1;
 cout << test;
 free(test);
 return 0;
}
char* fun(char buf[], char lpb[])
{
    char *ptr;
    ptr = strstr(buf, lpb);
 if(NULL == ptr)
 {
  cout << "notfond " << lpb;//这里要看你怎么取舍了 如果没找到则返回整个

//串也行  只是看题目要求
  return NULL;
 }
    
   int iLen = (int)(ptr-buf);
 char *p;
    p = (char *)malloc(sizeof(char)*(iLen+1));
 strncpy(p, buf, iLen);
 p[iLen] = '\0';
 return p;
}