void Shop::Add_Customer()
{
    fstream myfile; myfile.open("CustomerFile.txt");
    string name, password, phonenbr;
    string buffer, delimitor = "::";

    system("cls");
    cout << "Name of the customer: "; cin >> name;
    cout << "Password of the customer: "; cin >> password;
    cout << "Phone number of the customer: "; cin >> phonenbr;

    if (!myfile.is_open())
    {
        myfile.open("CustomerFile.txt", ios::out);
    }
    //myfile << name + delimitor + password + delimitor + phonenbr << endl;

    if (myfile.peek() == std::ifstream::traits_type::eof())
    {
        myfile << name + delimitor + password + delimitor + phonenbr << endl;
    }
    else
    {
        while (getline(myfile, buffer))
        {
            if (CheckIfCustomerExist(buffer, name, phonenbr) == true)
            {
                cout << "Customer already exist" << endl;
            }
            else
            {
                myfile << name + delimitor + password + delimitor + phonenbr << endl;
                cout << "Customer insert in the file " << endl;
            }
        }
    }


}