text: from pathlib import PurePosixPath
  from typing import Optional, Tuple
  
  
  def construct_full_path(remote_path: Optional[str], filename: str) -> str:
      if remote_path is None:
          return filename
      else:
          return (PurePosixPath("/") / remote_path / filename).as_posix()
  
  
  def deconstruct_full_path(filename: str) -> Tuple[str, str]:
      posix_path = PurePosixPath("/") / filename
      return str(posix_path.parent), posix_path.name
  