input: Write a python function to sort an array of integers in ascending order.
  assert sort_array([3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]) == [1, 1, 2, 3, 3, 4, 5, 5, 5, 6, 9]
  assert sort_array([10, 9, 8, 7, 6, 5, 4, 3, 2, 1]) == [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
  assert sort_array([5, 3, 8, 6, 2, 7, 4, 1]) == [1, 2, 3, 4, 5, 6, 7, 8]
output: def sort_array(arr):
      return sorted(arr)