input: Write a function to iterate over a list of numbers and print only the even numbers. The function should take a list of integers as input and print the even numbers in the list.
  assert print_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
  # Expected output:
  # 2
  # 4
  # 6
  # 8
  # 10
  assert print_even_numbers([2, 4, 6, 8, 10])
  # Expected output:
  # 2
  # 4
  # 6
  # 8
  # 10
  assert print_even_numbers([1, 3, 5, 7, 9])
  # Expected output:
  # (No output)
  assert print_even_numbers([])
  # Expected output:
  # (No output)
output: def print_even_numbers(numbers):
      for num in numbers:
          if num % 2 == 0:
              print(num)