input: Write a python function to find all even numbers in a list.
  assert find_even_numbers([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == [0, 2, 4, 6, 8, 10]
  assert find_even_numbers([1, 3, 5, 7, 9]) == []
  assert find_even_numbers([2, 4, 6, 8, 10]) == [2, 4, 6, 8, 10]
output: def find_even_numbers(lst):
      return [num for num in lst if num % 2 == 0]