public static CarConfiguration WithAutomaticAirConditioning(this CarConfiguration carConfiguration)
 => carConfiguration.WithOptionalEquipment(OptionalEquipment.Automatic_air_conditioning);
 public static CarConfiguration WithProfessionalNavigationSystems(this CarConfiguration carConfiguration)
 => carConfiguration.WithOptionalEquipment(OptionalEquipment.Navigation_system_professional);
 public static CarConfiguration WithPackage(this CarConfiguration carConfiguration, OptionalEquipment[] package)
 {
     return(carConfiguration.WithOptionalEquipment(package));
 }