int merge_two_ordered_arrays(unsigned size1, void const *arr1,
                             unsigned size2, void const *arr2,
                             unsigned size_result, void *result,
                             size_t sizeof_element,
                             int compare(const void *elem1, const void *elem2))
{
    unsigned ind1 = 0, ind2 = 0;
    void *curr_pos = result;
    while(ind1 < size1 && ind2 < size2 && ind1 + ind2 < size_result)
    {
        if(compare((char*)(arr1) + ind1*sizeof_element, (char*)(arr2) + ind2*sizeof_element) <= 0)
        {
            memcpy(curr_pos, (char*)(arr1) + ind1*sizeof_element, sizeof_element);
            ++ind1;
        }
        else
        {
            memcpy(curr_pos, (char*)(arr2) + ind2*sizeof_element, sizeof_element);
            ++ind2;
        }
        curr_pos = (char*)curr_pos + sizeof_element;
    }
    if(ind1 + ind2 < size_result)
    {
        if(ind1 < size1)
            memcpy(curr_pos, (char*)(arr1) + ind1*sizeof_element, (size_result - size2 - ind1)*sizeof_element);
        if(ind2 < size2)
            memcpy(curr_pos, (char*)(arr2) + ind2*sizeof_element, (size_result - size1 - ind2)*sizeof_element);
    }
    return EXIT_SUCCESS;
}