code: private char retrieveWrappingQuoteTypeOfJsonMemberNames(String jsonString) {
          char quote = '\"';   //  the default quote character used to specify json member names and string value according to the json specification
          for (char c : jsonString.toCharArray()) {
              if (c == '\'' || c == '\"') {
                  quote = c;
                  break;
              }
          }
          return quote;
      }
docs: Returns the quote character used for specifying json member names and String values of json members
  
  @param jsonString the source json from which to extract the wrapping quote
  @return either one of the characters ' (single quote)or " (double quote)