public static String uncapitalize(final String str) {
        return FIRST_CHAR_HANDLER_FUN.apply(str, Character::toLowerCase);
    }
Lowercase first letter

@param str string
@return the first letter of the result is lowercase
chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/util/StringUtils.java