input: 
  def optimize_printing_list(numbers: List[int]) -> str:
      """ Takes a list of integers, prints each integer on a new line using a more optimized approach.
      >>> optimize_printing_list([1, 2, 3, 4, 5, 6])
      '1\\n2\\n3\\n4\\n5\\n6\\n'
      """
  
output:     result = '\n'.join(map(str, numbers)) + '\n'
      return result