input: Write a function to sort the given list in descending order using Python. The function should modify the original list and not return a new list. If the input list is empty, it should remain empty.
  assert sort_list_desc([3, 7, 5, 8, 10])==None
  assert sort_list_desc([10, 8, 7, 5, 3])==None
  assert sort_list_desc([1, 2, 3, 4, 5])==None
  assert sort_list_desc([])==None
  assert sort_list_desc([3, 7, 5, 8, 10])==None
  assert sort_list_desc([10, 8, 7, 5, 3])==None
  assert sort_list_desc([1, 2, 3, 4, 5])==None
  assert sort_list_desc([])==None
  assert sort_list_desc([3, 7, 5, 8, 10])==None
  assert sort_list_desc([10, 8, 7, 5, 3])==None
  assert sort_list_desc([1, 2, 3, 4, 5])==None
  assert sort_list_desc([])==None
  assert sort_list_desc([3, 7, 5, 8, 10])==None
  assert sort_list_desc([10, 8, 7, 5, 3])==None
  assert sort_list_desc([1, 2, 3, 4, 5])==None
  assert sort_list_desc([])==None
  assert sort_list_desc([3, 7, 5, 8, 10])==None
  assert sort_list_desc([10, 8, 7, 5, 3])==None
  assert sort_list_desc([1, 2, 3, 4, 5])==None
  assert sort_list_desc([])==None
output: def sort_list_desc(lst):
      lst.sort(reverse=True)