prompt: Your task is to convert the following English description into an ASCII tree format.
  
  opencontainers is a principal directory that maintains 2 subdirectories: go-digest and image-spec.
  At the main level, 'go-digest' has nothing inside.
  At the main level, 'image-spec' houses 1 test-related directories.
  In nested path 'image-spec > specs-go', 'specs-go' organizes tests across 1 separate subdirectories.
  Within directory hierarchy 'image-spec > specs-go > v1', 'v1' is vacant.
  
  
  Format your response in this style:
  ```
  gradle
   +--api
   |   `--plugins
   |       `--catalog
   |           `--internal
   `--catalog
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "opencontainers\n +--go-digest\n `--image-spec\n     `--specs-go\n         `--v1", "description": "opencontainers is a principal directory that maintains 2 subdirectories: go-digest and image-spec.\nAt the main level, 'go-digest' has nothing inside.\nAt the main level, 'image-spec' houses 1 test-related directories.\nIn nested path 'image-spec > specs-go', 'specs-go' organizes tests across 1 separate subdirectories.\nWithin directory hierarchy 'image-spec > specs-go > v1', 'v1' is vacant.\n"}