input: Write a function to create an appointment and get its details.
  assert create_appointment("2023-12-01", "10:00 AM", "Doctor's Visit").get_details() == " The appointment is on 2023-12-01, at 10:00 AM, for Doctor's Visit."
  assert create_appointment("2023-12-25", "02:00 PM", "Business Meeting").get_details() == " The appointment is on 2023-12-25, at 02:00 PM, for Business Meeting."
  assert create_appointment("2023-11-15", "11:30 AM", "Lunch with John").get_details() == " The appointment is on 2023-11-15, at 11:30 AM, for Lunch with John."
output: def create_appointment(date, time, description):
      class Appointment:
          def __init__(self, date, time, description):
              self.date = date
              self.time = time
              self.description = description
          
          def get_details(self):
              return f" The appointment is on {self.date}, at {self.time}, for {self.description}."
      
      return Appointment(date, time, description)