input: Write a python function to create a date object and return its string representation.
  assert str(Date(5, 7, 2023)) == '05/07/2023'
  assert str(Date(15, 12, 1990)) == '15/12/1990'
  assert str(Date(1, 1, 2000)) == '01/01/2000'
output: def Date(day, month, year):
      return f"{day:02}/{month:02}/{year}"