what wrong in this code ? public static void main(String[] args) {

     Scanner scanner = new Scanner(System.in);
    int n = Integer.parseInt(scanner.nextLine());;
    String regex = "\\b(\\w+)(?:\\s+\\1\\b)+";
    Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
    while (n > 0) {
        String input = scanner.nextLine();
        Matcher matcher = pattern.matcher(input);
        String resultTmp = matcher.replaceAll("$1");
        System.out.println(resultTmp);
        n--;
    }
    scanner.close();
}