/*
 * concat.c
 *
 *  Created on: 6 июл. 2022 г.
 *      Author: alexander
 */

#include "concat.h"

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

char* concat(char *s1, char *s2)
{
    size_t len1 = s1 ? strlen(s1) : 0;
    size_t len2 = s2 ? strlen(s2) : 0;

    char *result = (char *)malloc(sizeof(char) * (len1 + len2 + 1));

    if (!result)
    {
        fprintf(stderr, "malloc() failed: insufficient memory!\n");
        return NULL;
    }

    if (s1)
    {
        strncpy(result, s1, (len1 + 1));
    }
    if (s2)
    {
        strncpy(result + len1, s2, (len2 + 1));
    }

    return result;
}