input: Write a function that takes a list of integers and returns a new list containing only the even numbers.
  
  def filter_even_numbers(lst):
      even_numbers = [num for num in lst if num % 2 == 0]
      return even_numbers
  
  assert filter_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == [2, 4, 6, 8, 10]
  assert filter_even_numbers([3, 5, 7, 9]) == []
  assert filter_even_numbers([2, 4, 6, 8, 10]) == [2, 4, 6, 8, 10]
  assert filter_even_numbers([]) == []
output: def filter_even_numbers(lst):
      even_numbers = [num for num in lst if num % 2 == 0]
      return even_numbers