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){
                        simpleprotocol.createMessage("sign-up", "true","User successfully signed up");
                        userDetails.put(username, password);
                    }
                }
            }
//          try{
//              socket.close();
//          }catch (IOException e){
//              e.printStackTrace();
//          }
    }