prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  packages
   +--pkg-a
   |   `--src
   +--pkg-b
   |   `--src
   `--shared
       `--src
  ```
  
  Convert this description:
  
  app is a core directory that includes 2 subdirectories: @modal and source.
  At the main level, '@modal' is a scoped package with 1 components.
  At level 2, in directory path '@modal → abc', The 'abc' container contains no subdirectories.
  Back to the top level.
  At the main level, The 'source' folder has been left empty.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "app\n +--@modal\n |   `--abc\n `--source", "description": "app is a core directory that includes 2 subdirectories: @modal and source.\nAt the main level, '@modal' is a scoped package with 1 components.\nAt level 2, in directory path '@modal \u2192 abc', The 'abc' container contains no subdirectories.\nBack to the top level.\nAt the main level, The 'source' folder has been left empty.\n"}