int CarRegister::getAllCarsWith(string * list, double upperPrice, double lowerPrice, double upperDistance, double lowerDistance) const {
    int added = 0;
    for (int i = 0; i < carCount; i++) {
        double p = cars[i]->getPrice();
        double d = cars[i]->getDistance();
        if (lowerPrice <= p && p <= upperPrice && lowerDistance <= d && d <= upperDistance)
            list[added++] = cars[i]->toString();
    }
    return added;
}