void swapNodes(song *a, song *b)
{
    // swap di utils.h
    swap(a->name, b->name);
    swap(a->artist, b->artist);

    unsigned short int t = a->length;
    a->length = b->length;
    b->length = t;
}

void selectionSort(Playlist l)
{
    song *start = l->head;
    song *temp;
    song *min;
    while (start->next != NULL)
    {
        min = start;
        temp = start->next;

        while (temp != NULL)
        {
            if (cmpItem(min->name, temp->name) > 0)
                min = temp;

            temp = temp->next;
        }

        swapNodes(start, min);
        start = start->next;
    }
}