C语言连接两个字符串

#include <stdio.h>
#include <string.h>

int main() {
   char s1[10] = "Taj";
   char s2[] = "Mahal";

   int i, j, n1, n2;

   n1 = strlen(s1);
   n2 = strlen(s2);

   j = 0;
   for(i = n1; i< n1+n2; i++ ) {
      s1[i] = s2[j];
      j++;
   }

   s1[i] = '\0';

   printf("%s", s1);

   return 0;
}