input: Write a function to filter out all the even numbers from a given list. This function should take a list of integers as input and return a list of integers, where only the even numbers from the input list are included.
  assert filter_even_numbers([3, 4, 5, 6, 7])==[4, 6]
  assert filter_even_numbers([2, 3, 4, 5, 6, 7, 8])==[2, 4, 6, 8]
  assert filter_even_numbers([11, 13, 15, 17])==[]
  assert filter_even_numbers([])==[]
  assert filter_even_numbers([0, 1, 2, 3, 4])==[0, 2, 4]
output: def filter_even_numbers(lst):
      return [num for num in lst if num % 2 == 0]