input: Write a function to sort a given list of items in descending order using Python. The function should return the sorted list.
  assert sort_descending([3, 7, 5, 8, 10])==[10, 8, 7, 5, 3]
  assert sort_descending([1, 2, 3, 4, 5])==[5, 4, 3, 2, 1]
  assert sort_descending([100, -2, 0, 45, 99])==[100, 99, 45, 0, -2]
  assert sort_descending([])==[]
  assert sort_descending([1])==[1]
output: def sort_descending(items):
      return sorted(items, reverse=True)