input: Write a function to filter numbers less than or equal to 10 from a list.
  assert filter_numbers([20, 5, 2, 15, 7, 10]) == [5, 2, 7, 10]
  assert filter_numbers([12, 9, 14, 3, 8, 6, 11]) == [9, 3, 8, 6]
  assert filter_numbers([1, 25, 18, 4, 10, 0]) == [1, 4, 10, 0]
output: def filter_numbers(numbers):
      return [num for num in numbers if num <= 10]