public void run(){
        String inputLine;

        try
        {
            //input stream reader
            //get socket writing and reading streams
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            DataOutputStream out = new DataOutputStream(socket.getOutputStream());

            out.writeBytes(simpleprotocol.createMessage("sign-up", "true", "Welcome to my Server") + "\n");

            //Now start reading input from client
            while((inputLine = in.readLine()) != null) {
                //reply with the same message, adding some text
                chooseFunction(inputLine);
                out.writeBytes((inputLine) +"\n");
            }

            //client disconnected, so close socket
//            socket.close();
        }

        catch (IOException e)
        {
            System.out.println("IOException on socket : " + e);
            e.printStackTrace();
        }
    }


    public void chooseFunction(String message){
        String[] received = simpleprotocol.decodeMessage(message);
        String function = received[0];

        if(function.equals("sign-up")){
            userSignUp(message);
        }else if(function.equals("sign-in")){
            userSignIn(message);
        }else if(function.equals("get-message")){
            getMessage(message);
        }else if(function.equals("send-message")){
            sendMessage(message);
        }
    }


    public void userSignUp(String credentials){
        String[] received = simpleprotocol.decodeMessage(credentials);
        String username = received[1];
        String password = received[2];


            if(!(userDetails.containsKey(username))){
                if(username.length() >=5 && username.length() <=20){
                    if(password.length() >= 8 && password.length() <=32){
                            userDetails.put(username, password);
            simpleprotocol.createMessage("sign-up", "true","User successfully signed up");

                    }
                }
            }