input: Write a python function to filter numbers divisible by 5.
  assert divisible_five([1, 5, 10, 15, 20, 25, 30]) == [5, 10, 15, 20, 25, 30]
  assert divisible_five([2, 4, 6, 8, 10, 12, 14]) == [10]
  assert divisible_five([3, 6, 9, 12, 15, 18, 21]) == [15]
output: def divisible_five(numbers):
      return [num for num in numbers if num % 5 == 0]