Function get_prefix

src/misc/sysos.cpp:614–621

    }

    string get_prefix ( const string & req ) {
        auto np = req.find_last_of("\\/");
        if ( np != string::npos ) {
            return req.substr(0,np);
        } else {
            return req;
        }
    }

    string get_suffix ( const string & req ) {
        auto np = req.find_last_of("\\/");