input: Write a function to filter out even numbers from a given list of integers. If the list is empty, return an empty list. The function should take a list as input and return a list of even numbers.
  assert filter_even_numbers([1, 2, 3, 4, 5, 6])==[2, 4, 6]
  assert filter_even_numbers([11, 13, 15, 17])==[]
  assert filter_even_numbers([2, 4, 6, 8, 10])==[2, 4, 6, 8, 10]
  assert filter_even_numbers([])==[]
  assert filter_even_numbers([1, 3, 5, 7, 9])==[]
output: def filter_even_numbers(lst):
      return [x for x in lst if x % 2 == 0]