if (userChoice == "ADD")
        {
            string username = "";
            cout << "Enter the user's name." << endl;
            cout << "> ";

            getline(cin,username);
            cin.ignore();

            localLibrary.addAccount(username);
            cout << "> ";
            cin >> userChoice;
        }
else
        {
            cout << "Invalid command." << endl << endl;
            cout << "> ";
            cin >> userChoice;
        }

OUTPUT:
Enter the user's name.
> first last
AccountID# 26 successfully created.
> Invalid command.
> Invalid command.