bool CustomerRegister::removeCustomer(const string customerNumber, const string name)
{
    Customer *c = new Customer(name,customerNumber);
    int pos = this->customerExist(*c);
    if (pos == -1) {
        delete c;
        throw "Customer don't exist in register...";
        return false;
    }

    // adds the last customer to the pos. should I delete it too?
    delete this->customers[pos];
    this->customers[pos] = nullptr;
    this->customers[pos] = this->customers[this->nrOfCustomers - 1];
    this->nrOfCustomers--;
    return true;
}