input: Write a python function to print each element of a list on a new line.
  assert print_elements([1, 5, 7, 10])==None  # Function prints elements, returns None
  assert print_elements([3, 6, 9])==None  # Function prints elements, returns None
  assert print_elements([2, 4, 8, 16])==None  # Function prints elements, returns None
output: def print_elements(lst):
      for elem in lst:
          print(elem)