input: Write a python function to print elements of a list in reverse order.
  assert print_reverse([1, 2, 3, 4, 5]) == None  # Expected output: 5 4 3 2 1
  assert print_reverse([10, 20, 30]) == None    # Expected output: 30 20 10
  assert print_reverse([]) == None              # Expected output: (no output)
output: def print_reverse(lst):
      for item in reversed(lst):
          print(item, end=' ')
      print()