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