input: 
  def optimize_print_list(numbers: List[int]) -> str:
      """
      Optimizes the printing of elements in a list by using a single print statement with the unpacking operator.
      >>> optimize_print_list([1, 2, 3, 4, 5, 6])
      '1\\n2\\n3\\n4\\n5\\n6'
      >>> optimize_print_list([10, 20, 30])
      '10\\n20\\n30'
      """
      return '\n'.join(map(str, numbers))
  
output:     return '\n'.join(map(str, numbers))