input: Write a python function to sort a list of numbers in descending order.
  assert sort_descending([5, 1, 8, 10, 0, 4]) == [10, 8, 5, 4, 1, 0]
  assert sort_descending([3, 9, 2, 6, 5, 4]) == [9, 6, 5, 4, 3, 2]
  assert sort_descending([1, 4, 1, 3, 2, 2]) == [4, 3, 2, 2, 1, 1]
output: def sort_descending(lst):
      return sorted(lst, reverse=True)