input: Write a python function to filter numbers greater than 5 using the test_gt_5 function.
  assert filter_gt_5([1, 6, 3, 7, 5, 8, 2, 9]) == [6, 7, 8, 9]
  assert filter_gt_5([10, 4, 12, 3, 15]) == [10, 12, 15]
  assert filter_gt_5([5, 1, 2, 3]) == []
output: def filter_gt_5(numbers):
      def test_gt_5(x):
          return x > 5
      return list(filter(test_gt_5, numbers))