Refactored_motor2.cs

public class MogeInvoice : Invoice
{
	public MogeInvoice(Motorcycle motor, Duration duration) : base(Motorcycle motor, Duration duration)
	{
	}

	public override Double CalculateInvoice()
	{
         // perhitungan invoice Moge
	}
}

public static class InvoiceFactory
{
	public static Invoice Create(Motorcycle motor, Duration duration)
	{
		return motor.type switch {
			"rent" => return new RentInvoice(motor, duration),
			"loan" => return new LoanInvoice(motor, duration),
			"personal" => return new PersonalInvoice(motor, duration),
				
			// tambah disini!
			"moge" => return new MogeInvoice(motor, duration),
				
			_ => throw new Exception("Motorcycle type is invalid!"),
		};
	}
}