Old Encrypt Solution

string encrypt(const string& s, int n) {

    int real_shift = n % 26;
    string new_string = "";
    for (int i = 0; i < s.length(); i++) {
        if (s[i] != ' ') {
            if (s[i] + real_shift > 'z') {
                new_string += s[i] + real_shift - 'z' + 96;
            }
            else {
                new_string += s[i] + real_shift;
            }

        }
        else {
            new_string += ' ';
        }
    }

    return new_string;
}