static void Main(string[] args)
{
var request = new LeaveRequest {
Employee = "John Smith", LeaveDays = 34
};
ILeaveRequestHandler supervisor = new Supervisor();
ILeaveRequestHandler manager = new ProjectManager();
ILeaveRequestHandler hr = new Hr();
supervisor.NextHandler = manager;
manager.NextHandler = hr;
supervisor.HandleRequest(request);
request.LeaveDays = 14;
supervisor.HandleRequest(request);
request.LeaveDays = 4;
supervisor.HandleRequest(request);
Console.ReadLine();
}