input: Write a python function to print all even numbers from a given list.
  assert print_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == "2\n4\n6\n8\n10\n"
  assert print_even_numbers([10, 20, 45, 67, 84, 93]) == "10\n20\n84\n"
  assert print_even_numbers([5, 7, 9, 8, 6, 4, 3]) == "8\n6\n4\n"
output: def print_even_numbers(lst):
      result = "\n".join(str(num) for num in lst if num % 2 == 0) + "\n"
      return result