public static boolean search(String a, String b, String c) {
    int len = c.length();
    for (int i = 0; i <= a.length() - len; i++)
        if (a.substring(i, i + len).equals(c))
            return true;

    for (int i = 0; i <= b.length() - len; i++)
        if (b.substring(i, i + len).equals(c))
            return true;

    return false;
}