public List <Doctor> IsDoctorFreeToday(int day, int hour)
        {
            List <Doctor> availibityDoctors = new List <Doctor>();

            try
            {
                if (ArgumentValidate(day, hour))
                {
                    foreach (var doctor in doctors)
                    {
                        WorkDay singleDay = doctor.GetSignleWorkDay(day);
                        if (singleDay.IsFreeHour(hour))
                        {
                            availibityDoctors.Add(doctor);
                        }
                    }
                }

                return(availibityDoctors);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

            return(null);//TODO: TEGO NIE MOZE BYC!!! GOD 23:27 NIE MAM SIL:)
        }