Refactor and fix error hydration message socket io

- Position message send will be on format :
message :
                    userId : user identification
                    roomId: room identification
                    position: position of user in map
                        x: user x position on map
                        y: user y position on map
 - Create Point object and interface to have position x and y of user in map.

back/src/Model/Websocket/ExSocketInterface.ts

@@ -1,5 +1,7 @@
 import {Socket} from "socket.io";
+import {PointInterface} from "./PointInterface";
 
 export interface ExSocketInterface extends Socket {
     token: object;
+    position: PointInterface;
 }

back/src/Model/Websocket/MessageUserPosition.ts

@@ -1,14 +1,30 @@
 import {Message} from "./Message";
+import {PointInterface} from "./PointInterface";
+
+export class Point implements PointInterface{
+    x: number;
+    y: number;
+
+    constructor(x : number, y : number) {
+        this.x = x;
+        this.y = y;
+    }
+
+    toJson(){
+        return {
+            x : this.x,
+            y: this.y
+        }
+    }
+}
 
 export class MessageUserPosition extends Message{
-    positionXUser: string;
-    positionYUser: string;
+    position: PointInterface
 
     constructor(message: string) {
         super(message);
         let data = JSON.parse(message);
-        this.positionXUser = data.positionXUser;
-        this.positionYUser = data.positionYUser;
+        this.position = new Point(data.position.x, data.position.y);
     }
 
     toString() {
@@ -16,8 +32,7 @@ export class MessageUserPosition extends Message{
             Object.assign(
                 super.toJson(),
                 {
-                    positionXUser: this.positionXUser,
-                    positionYUser: this.positionYUser
+                    position: this.position.toJson()
                 })
         );
     }

back/src/Model/Websocket/PointInterface.ts

@@ -0,0 +1,5 @@
+export interface PointInterface {
+    x: number;
+    y: number;
+    toJson() : object;
+}