Books

    private static boolean present(String title, String book) {
        int i = 0, j = title.length();
        String sub;

        while (j <= book.length()) {
            sub = book.toLowerCase().substring(i, j);
            if (title.toLowerCase().equals(sub)) {
                return true;
            }
            i++;
            j++;
        }
        return false;
    }