Contact::Contact(const char *name, const long long *phoneNumber, int numOfPhoneNumber)
    {
        if (name != 0)
        {
            strncpy(this->contactName, name, 19);
            contactName[19] = '\0';
            ArraySize = numOfPhoneNumber;

            phoneNumbers = new long long[ArraySize];

            for (int i = 0; i < ArraySize; i++) {
                if (phoneNumber[i] > 10000000000 && phoneNumber[i] < 999999999999) {
                    phoneNumbers[i] = phoneNumber[i];
                }
            }
        }
        else {
            *this = Contact();
        }
    }