class_docstr: Transforms input by add punctuation at the end of sentence.
code: def __repr__(self):
      return "CnPunctuation"
  
file_path: textflint/textflint/generation/transformation/UTCN/cn_punctuation.py
imports: from ..transformation import Transformation
label_desc: Use image node_id 2 for calling the CnPunctuation obj's underlying member method code with example usage: obj.__repr__() and returns: str