prompt: Your task is to convert the following English description into an ASCII tree format.
  
  dir --out-dir --keep-file-extension is a principal directory that assembles 2 subdirectories: in-files and out-files.
  At the top level, 'in-files' carries 1 nested folders: src.
  In nested path 'in-files → src', Inside 'src', you'll find it remains unused.
  At the top level, 'out-files' comprises 1 contained folders: lib.
  At level 2, in directory path 'out-files / lib', The 'lib' repository awaits content.
  Back to the top level.
  
  
  Format your response in this style:
  ```
  image-optimizer
   +--app
   |   +--pages
   |   |   `--api
   |   |       `--stateful
   |   `--public
   `--test
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "dir --out-dir --keep-file-extension\n +--in-files\n |   `--src\n `--out-files\n     `--lib", "description": "dir --out-dir --keep-file-extension is a principal directory that assembles 2 subdirectories: in-files and out-files.\nAt the top level, 'in-files' carries 1 nested folders: src.\nIn nested path 'in-files \u2192 src', Inside 'src', you'll find it remains unused.\nAt the top level, 'out-files' comprises 1 contained folders: lib.\nAt level 2, in directory path 'out-files / lib', The 'lib' repository awaits content.\nBack to the top level.\n"}