input: Write a function to filter out all the even numbers from a given list. The function should return a list containing only the even numbers from the input list. If the input list is empty, it should return an empty list.
  
  assert filter_even_numbers([3, 4, 5, 6, 7]) == [4, 6]
  assert filter_even_numbers([1, 3, 5, 7]) == []
  assert filter_even_numbers([2, 4, 6, 8, 10]) == [2, 4, 6, 8, 10]
  assert filter_even_numbers([]) == []
output: def filter_even_numbers(lst):
      return [num for num in lst if num % 2 == 0]