void login_user(vector<Users*> &User,Users& current_user){
    cout << "Welcome to KAPPA BET!" << endl;
    cout << "Please type username and password to login to your account!" << endl;
    cout << "If you don't have an account ,press (Enter) or type guest:guest to login as guest" << endl;
    int anagnwr=-1;
    int guest=0;
    int redo;
    do{
        redo=0;
        cout << "username: " ;
        string name;
        string rightpass;
        getline(cin,name);
        if (name.size()==0)
            name.assign("\n");
        if((name.compare("guest:guest") == 0) || name.compare("\n")==0){
            guest = 1;
            break;
        }
        for(int i=0;i<User.size();i++){
            if(name.compare(User[i]->ID.username) == 0){
                rightpass.assign(User[i]->ID.password);
                anagnwr=i;
            }
        }
        string provpass;
        cout << "password: ";
        getline(cin,provpass);
        if(provpass.size()==0)
            provpass.assign("\n");
        if(provpass.compare(rightpass) == 0){
            redo=0;
        }
        else{
            cout << "Wrong Credentials! Please Retry!" << endl;
            redo=1;
        }
    }while(redo);
    if(guest == 0){
        char locked = 'L';
        if(locked == User[anagnwr]->ID.status[0]){
            cout << "Your account has been locked due to: ";
            for(int i=2;User[anagnwr]->ID.status[i] != '\n';i++){
                cout << User[anagnwr]->ID.status[i];
            }
            exit(1);
        }
    }
    //eisodos xrhsth sto arxiko menu analoga me to user.type h an einai guest
    if(guest == 1){
        Users* temp = new Guest();
        //gurnaw
        current_user = *temp;
        temp->exprint();

    }
    else{
        current_user = *User[anagnwr];
        User[anagnwr]->exprint();
    }
    write_users(User);
}