input: Write a function to sort the given list of items in descending order. The function should take a list as input and return the sorted list. If the input list is empty, it should return the empty list.
  assert sort_descending([3, 7, 5, 8, 10])==[10, 8, 7, 5, 3]
  assert sort_descending([1, 2, 3])==[3, 2, 1]
  assert sort_descending([9, 9, 9])==[9, 9, 9]
  assert sort_descending([])==[]
output: def sort_descending(items):
      return sorted(items, reverse=True)