input: Write a function to filter a list of integers and return only even numbers. If the given list is empty then return an empty list.
  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([1, 3, 5, 7, 9])==[]
  assert filter_even_numbers([0, 2, 4, 6, 8, 10])==[0, 2, 4, 6, 8, 10]
  assert filter_even_numbers([])==[]
  assert filter_even_numbers([-2, -1, 0, 1, 2])==[-2, 0, 2]
output: def filter_even_numbers(lst):
      even_numbers = [num for num in lst if num % 2 == 0]
      return even_numbers