code: public char normalize(char currentChar) {
          if (NORMALIZE_UPPER == getNormalization()) {
              return toUpper(currentChar);
          }
          if (NORMALIZE_LOWER == getNormalization()) {
              return toLower(currentChar);
          }
          return currentChar;
      }
docs: Take the input character and normalize based on this normalizer instance.
  
  @param currentChar
  @return char (normalized based on settings)