input: Write a python function to shuffle a list randomly.
  assert len(shuffle_list([1, 2, 3, 4, 5])) == 5
  assert set(shuffle_list([10, 20, 30, 40])) == {10, 20, 30, 40}
  assert len(shuffle_list([])) == 0
output: import random
  
  def shuffle_list(lst):
      shuffled_lst = lst[:]
      random.shuffle(shuffled_lst)
      return shuffled_lst