input: Write a function to filter numbers not divisible by 5.
  assert filter_divisible_by_5([11, 23, 7, 20, 44, 16, 9])==[11, 23, 7, 44, 16, 9]
  assert filter_divisible_by_5([10, 25, 30, 45, 50])==[]
  assert filter_divisible_by_5([1, 2, 3, 4, 6, 8, 11])==[1, 2, 3, 4, 6, 8, 11]
output: def filter_divisible_by_5(numbers):
      return [num for num in numbers if num % 5 != 0]