实现strcta函数

#include <stdio.h>
#include <string.h>
#define MAXS 10
char *str_cat( char *s, char *t ){
  int i=0;
  int j=0;
  for(i=strlen(s);i<(strlen(s)+strlen(t));i++){
    s[i]=t[j];
    ++j;    
  }
  s[i+1]='\0';
  return  s;
}
int main()
{
    char *p;
    char str1[MAXS+MAXS] = {'\0'}, str2[MAXS] = {'\0'};
    scanf("%s%s", str1, str2);
    p = str_cat(str1, str2);
    printf("%s\n%s\n", p, str1);
    return 0;
}