public HolidayController(
     IBus bus,
     IEmployeeRepository employeeRepository,
     IHolidayValidator holidayValidator,
     IAppointmentService appointmentService)
 {
     _bus = bus;
     _employeeRepository = employeeRepository;
     _holidayValidator   = holidayValidator;
     _appointmentService = appointmentService;
 }
 public HolidayController(
     IBus bus,
     IEmployeeRepository employeeRepository,
     IHolidayValidator holidayValidator,
     IAppointmentService appointmentService)
 {
     _bus = bus;
     _employeeRepository = employeeRepository;
     _holidayValidator = holidayValidator;
     _appointmentService = appointmentService;
 }