【C语言】将两个字符串连接起来

#include<stdio.h>
int main()
{
    char s1[100] = "I ";
    char s2[100] = "am a student";
    int i, j, n;
    for (i = 0; s1[i] != ''; i++)
        ;
    n = i;
    for (j = 0; s2[j] != ''; j++)
    {
        s1[n] = s2[j];
        n = n + 1;
    }
    s1[n] = '';
    printf("%s", s1);


}