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