did it using ascii value in Java public static String caesarCipher(String s, int k) { String s1 = ""; int k1;

for (int i = 0; i < s.length(); i++) {
    char c = s.charAt(i);
    if (c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z') {
        k1 = k;

        while (k1 > 0) {
            if (Character.isLowerCase(c) && c + k1 <= 'z') {
                c = (char) (c + k1);
                break;
            } else if (Character.isLowerCase(c) && c + k1 > 'z') {
                k1 -= ('z' - c + 1);  
                c = 'a';  
            } else if (Character.isUpperCase(c) && c + k1 <= 'Z') {
                c = (char) (c + k1);
                break;
            } else if (Character.isUpperCase(c) && c + k1 > 'Z') {
                k1 -= ('Z' - c + 1); 
                c = 'A'; 
            }
        }

        s1 += c;
    } else {
        s1 += c; 
    }
}

return s1;

}