void Ds::GetAllCreaturesByLevel(int MagiID, int **Creatures, int *numOfCreatures) {
    if (MagiID < 0) {
        if (creaturesByLevel.size() == 0) {
            *numOfCreatures = 0;
            *Creatures = NULL;
            return;
        }
        int size = creaturesByLevel.size();
        (*Creatures) = (int*) malloc(sizeof(int) * size);
        if (*Creatures == NULL) {
            throw bad_alloc();
        }
        Creature** tmpCreatures = creaturesByLevel.treeToArr();
        for (int i = 0; i < size; ++i) {
            (*Creatures)[size - 1 - i] = tmpCreatures[i]->ID();
        }
        delete[] tmpCreatures;
        *numOfCreatures = size;
        return;
    }
    Magi* magi = NULL;
    Magi tmpMagi = Magi(MagiID);
    if (Magis.find(&tmpMagi, &magi) == false) {
        throw DataDoesntExist();
    }
    int size = magi->numOfCreatures();
    if(!size) {
        *numOfCreatures = 0;
        *Creatures = NULL;
        return;
    }

    int* temp= (int*) malloc(sizeof(int) * size);
    (*Creatures) = temp;
    if (*Creatures == NULL) {
        throw bad_alloc();
    }

    magi->GetAllCreaturesByLevel(Creatures, numOfCreatures);
}