input: Write a python function to calculate the sum of even numbers in a list using recursion.
  assert print_even_sum([1, 2, 3, 4, 5, 6, 7, 8]) == 20
  assert print_even_sum([10, 21, 32, 43, 54]) == 96
  assert print_even_sum([2, 4, 6, 8, 10]) == 30
  assert print_even_sum([1, 3, 5, 7, 9]) == 0
  assert print_even_sum([]) == 0
output: def print_even_sum(lst):
      if not lst:
          return 0
      head, *tail = lst
      if head % 2 == 0:
          return head + print_even_sum(tail)
      else:
          return print_even_sum(tail)