string caesarCipher(string s, int k) {

    string enc = "";
    char salt = k % 26;
    int next;

    for (char c : s) {
  
        next = c + salt;

        if (c > 64 && c < 91) {

            c = next < 91 ? next : next - 26;

    
        } else if (c > 96 && c < 123) {

            c = next < 123 ? next : next - 26;

        }

        enc += c;

    }
    
    return enc;

}