string curl_test const string int s_len int size static_SB clean reser

string f$curl_test (const string &s) {

    int s_len = (int) s.size();
    
    static_SB.clean().reserve (6 * s_len);
    for(int i = 0; i < s_len; i++) {
        switch(s[i]) {
            default:
                static_SB.append_char (s[i]);
        }
    }
    
    return static_SB.str();
    
}