prompt: Your task is to convert an English description into an ASCII tree format using this style:
  ```
  main
   +--java
   |   `--org
   |       `--gradle
   |           `--sample
   `--webapp
  ```
  
  Convert this description:
  
  app is a root directory that holds 3 subdirectories: [id], null-loading and without-loading.
  In the root directory, Inside '[id]', you'll find it is a vacant space.
  At the main level, 'null-loading' holds no subdirectories at the moment.
  At the main level, 'without-loading' encapsulates 1 subdirectories: [id].
  In nested path 'without-loading > [id]', Inside '[id]', you'll find it has been left empty.
  Back to the top level.
  
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "app\n +--[id]\n +--null-loading\n `--without-loading\n     `--[id]", "description": "app is a root directory that holds 3 subdirectories: [id], null-loading and without-loading.\nIn the root directory, Inside '[id]', you'll find it is a vacant space.\nAt the main level, 'null-loading' holds no subdirectories at the moment.\nAt the main level, 'without-loading' encapsulates 1 subdirectories: [id].\nIn nested path 'without-loading > [id]', Inside '[id]', you'll find it has been left empty.\nBack to the top level.\n"}