input: Write a function to shuffle a list of numbers. The function should use the `random.shuffle` method to shuffle the list in place and then return the shuffled list. If the input list is empty, the function should return an empty list.
  assert shuffle_list([1, 2, 3, 4, 5])!=[1, 2, 3, 4, 5]
  assert shuffle_list([])==[]
output: def shuffle_list(lst):
      if not lst:
          return []
      random.shuffle(lst)
      return lst