void *my_malloc(size_t size)
{
    char *unaligned;
    char *aligned;

    if (size == 0)
        return NULL;

    unaligned = malloc(size+16);
    if (unaligned == NULL)
        return NULL;

    aligned = (char *)((intptr_t)(unaligned + 16) & ~15);
    aligned[-1] = (char)(unaligned - aligned);

    return aligned;
}

void my_free(void *aligned)
{
    if (aligned == NULL)
        return;

    free(aligned - aligned[-1]);
}