input: Write a python function to sort an array in ascending order.
  assert sortArray([9, 5, 1, 10]) == [1, 5, 9, 10]
  assert sortArray([4, 3, 2, 1]) == [1, 2, 3, 4]
  assert sortArray([20, 10, 30, 25]) == [10, 20, 25, 30]
output: def sortArray(arr):
      return sorted(arr)