input: Write a python function to filter even numbers from a given list.
  assert even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == [2, 4, 6, 8, 10]
  assert even_numbers([10, 21, 32, 43, 54, 65]) == [10, 32, 54]
  assert even_numbers([11, 13, 17, 19, 23]) == []
output: def even_numbers(lst):
      return [num for num in lst if num % 2 == 0]