input: Write a function to filter even numbers from a list.
  assert filter_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == [2, 4, 6, 8, 10]
  assert filter_even_numbers([11, 13, 15, 18, 20, 22, 25]) == [18, 20, 22]
  assert filter_even_numbers([2, 4, 6, 8, 10]) == [2, 4, 6, 8, 10]
output: def filter_even_numbers(numbers):
      return [num for num in numbers if num % 2 == 0]