prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  image-optimizer
   +--app
   |   +--pages
   |   |   `--api
   |   |       `--stateful
   |   `--public
   `--test
  ```
  
  Convert this description:
  
  scaffold-config is a principal directory that maintains 2 subdirectories: src and test.
  At the top level, 'src' is unpopulated.
  At the main level, 'test' bundles 1 test-related directories.
  At level 2, in directory path 'test → unit', 'unit' remains unused.
  Back to the top level.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "scaffold-config\n +--src\n `--test\n     `--unit", "description": "scaffold-config is a principal directory that maintains 2 subdirectories: src and test.\nAt the top level, 'src' is unpopulated.\nAt the main level, 'test' bundles 1 test-related directories.\nAt level 2, in directory path 'test \u2192 unit', 'unit' remains unused.\nBack to the top level.\n"}