#include <stdio.h>
#include<string.h>
int main()
{
char str1[100], str2[100];
printf("Please, enter the first string = ");
gets(str1)
printf("\nPlease, enter the second string = ");
gets(str2)
strncat(str1, str2, 4);
printf("\nThe concatenate string is = %s",str1);
return 0;
}