docs: public static String getFirstLetter(String text, String separator) {
  		try {
  			PinyinFormat format = new PinyinFormat();
  			format.setCutFormat(PinyinCUTFormat.CUT_FIRST_LETTER);
  			format.setToneFormat(PinyinTONEFormat.TONE_NONE);
  			if ($.notNull(separator)) {
  				format.setSeparator(separator);
  			}
  			return getPinyin(text, format);
  		} catch (Exception e) {
  			e.printStackTrace();
  		}
  		;
  		return null;
  	}