domain fix

        // ----- Build Google Sheet tab name: domain (dots->underscores) + survey name -----

        std::string buildSheetName(const std::string &surveyName) {

            std::string domain = Args->config->getDomain();

            // Extract hostname from site URL (strip scheme and port, like cookie domain)

            std::string url = Args->config->getsiteurl();

            std::string host;

            auto schemeEnd = url.find("://");

            if (schemeEnd != std::string::npos)

                host = url.substr(schemeEnd + 3);

            else

                host = url;

            auto colon = host.find(':');

            if (colon != std::string::npos)

                host = host.substr(0, colon);

            auto slash = host.find('/');

            if (slash != std::string::npos)

                host = host.substr(0, slash);

            std::string sheet;

            sheet.reserve(domain.size() + 1 + surveyName.size());

            for (char c : domain) {

            sheet.reserve(host.size() + 1 + surveyName.size());

            for (char c : host) {

                sheet += (c == '.') ? '_' : c;

            }

            sheet += '_';