C语言问题 求解

题目的意思是说s2比s1短，或长度相等，就把整个s2接到s1后面吗？

#include

#include

int main(void) {

  char s1[27], s2[27];

  char *p, *t, s[53];

  fgets(s1, 27, stdin);

  fgets(s2, 27, stdin);

  t = strchr(s1, '\n');

  if (t)   *t = '\0';

  t = strchr(s2, '\n');

  if (t)   *t = '\0';

  int l1 = strlen(s1);

  int l2 = strlen(s2);

  if (l1 < l2) {

    p = s1;

    t = s;

    while (*p) *t++ = *p++;

    p = s2 + (p - s1);

    while (*p) *t++ = *p++;

  }

  else {

    p = s1;

    t = s;

    while (*p) *t++ = *p++;

    p = s2;

    while (*p)   *t++ = *p++;

  }

  puts(s);

  return 0;

}