input: Write a python function to shuffle an array using the random.shuffle method.
  assert shuffle([1, 2, 3, 4, 5]) != [1, 2, 3, 4, 5]
  assert sorted(shuffle([10, 20, 30, 40, 50])) == [10, 20, 30, 40, 50]
  assert shuffle([7, 8, 9]) != [7, 8, 9]
output: import random
  
  def shuffle(arr):
      random.shuffle(arr)
      return arr