void dodajElement(Lista*& start, int wartosc)
{
    Lista* el = start;
    if (el)
    {
        while (el->head->wartosc != wartosc)
        {
            el = el->head;
        }

        Lista elDoUsuniecia = el->head;
        el->head = el->head->head;
        delete elDoUsuniecia;
    }
}