input: Write a function to shuffle elements in an array using the random.shuffle method.
  assert len(shuffleArray([1, 2, 3, 4, 5, 6])) == 6
  assert set(shuffleArray([1, 2, 3, 4, 5, 6])) == {1, 2, 3, 4, 5, 6}
  assert len(shuffleArray([10, 20, 30, 40, 50])) == 5
  assert set(shuffleArray([10, 20, 30, 40, 50])) == {10, 20, 30, 40, 50}
output: import random
  
  def shuffleArray(arr):
      random.shuffle(arr)
      return arr