input: Write a python function to get the current date and time in the format "DD/MM/YYYY HH:MM".
  assert get_current_datetime() == datetime.datetime.now().strftime("%d/%m/%Y %H:%M")
  assert isinstance(get_current_datetime(), str)
  assert len(get_current_datetime()) == 16
output: def get_current_datetime():
      from datetime import datetime
      return datetime.now().strftime("%d/%m/%Y %H:%M")