input: Write a function to randomize a list of given integers using an optimized Fisher-Yates algorithm.
  assert randomized_list([1, 2, 3, 4, 5]) != [1, 2, 3, 4, 5]
  assert len(randomized_list([1, 2, 3, 4, 5])) == 5
  assert all(x in randomized_list([1, 2, 3, 4, 5]) for x in [1, 2, 3, 4, 5])
  assert randomized_list([]) == []
  assert randomized_list([7]) == [7]
output: import random
  
  def randomized_list(lst):
      for i in range(len(lst) - 1, 0, -1):
          j = random.randint(0, i)
          lst[i], lst[j] = lst[j], lst[i]
      return lst