prompt: Your task is to convert the following English description into an ASCII tree format.
  
  app is a primary directory that maintains 2 subdirectories: greeting and refetch-on-new-base-tree.
  At the top level, Inside 'greeting', you'll find it is devoid of content.
  At the top level, 'refetch-on-new-base-tree' encompasses 2 nested folders: a, b.
  In nested path 'refetch-on-new-base-tree > a', 'a' has no folders inside.
  Within directory hierarchy 'refetch-on-new-base-tree > b', The 'b' data structure has nothing inside.
  Back to the top level.
  
  
  Format your response in this style:
  ```
  kotlin
   +--my-sub-project
   `--src
       +--main
       |   `--java
       `--test
           `--java
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "app\n +--greeting\n `--refetch-on-new-base-tree\n     +--a\n     `--b", "description": "app is a primary directory that maintains 2 subdirectories: greeting and refetch-on-new-base-tree.\nAt the top level, Inside 'greeting', you'll find it is devoid of content.\nAt the top level, 'refetch-on-new-base-tree' encompasses 2 nested folders: a, b.\nIn nested path 'refetch-on-new-base-tree > a', 'a' has no folders inside.\nWithin directory hierarchy 'refetch-on-new-base-tree > b', The 'b' data structure has nothing inside.\nBack to the top level.\n"}