oid Interface::Interface_commander(string instruction) {

    stringstream ss(instruction);
    istream_iterator<string> begin(ss);
    istream_iterator<string> end;
    vector<string> vStr(begin, end);

    copy(vStr.begin(), vStr.end(), std::ostream_iterator<std::string>(cout, ", "));

    if (vStr[0] == "addmat") {
      //  cout << vStr[1];
        int tmpNumberOfDimensions = atoi(vStr[1].c_str());
        cout << tmpNumberOfDimensions;


    } else if (vStr[0] == "exit") {
        cout << "EXIT";
    } else {
        cout << "choose a correct command !!!\n" << endl;
    }

}