docs: def clean_dictkeys(ddict, exclusions=None):
      """
      Exclude chars in dict keys and return a clean dictionary.
      """
      exclusions = [] if exclusions is None else exclusions
  
      if not isinstance(ddict, dict):
          return {}
  
      for key in list(ddict.keys()):
          if [incl for incl in exclusions if incl in key]:
              data = ddict.pop(key)
              clean_key = exclude_chars(key, exclusions)
  
              if clean_key:
                  if clean_key in ddict:
                      ddict[clean_key] = force_list(ddict[clean_key])
                      add_element(ddict, clean_key, data)
                  else:
                      ddict[clean_key] = data
  
          # dict case
          if isinstance(ddict.get(key), dict):
              ddict[key] = clean_dictkeys(ddict[key], exclusions)
  
          # list case
          elif isinstance(ddict.get(key), list):
              for row in ddict[key]:
                  if isinstance(row, dict):
                      row = clean_dictkeys(row, exclusions)
  
      return ddict