input: Write a python 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([25, 35, 8, 2, 10])==[8, 2, 10]
  assert filter_even_numbers([11, 13, 15, 20, 22])==[20, 22]
output: def filter_even_numbers(lst):
      return [num for num in lst if num % 2 == 0]