code: def register_contaminant_cpp(self, dirt_string):
      self.dirt_ngrams.update(
          janitor_util.clean_ngram(
              dirt_string, self.delete_chars, self.ngram_n
          )
      )
  
imports: import re
  import string
  import timeit
  import pickle
  import traceback
  from pprint import pprint
label_desc: Use image node_id 7 for calling the Janitor obj's underlying member method code with example usage: obj.register_contaminant_cpp(dirt_string) without return types