feat: subdivide clienthandler into messageprocessor

app/src/main/java/clientserver/server/MessageProcessor.java

@@ -0,0 +1,51 @@
+package clientserver.server;
+
+import clientserver.client.Client;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+
+public class MessageProcessor {
+
+    private final Client client;
+    private final DatagramSocket clientHandlerSocket;
+    private final ClientHandler clientHandler;
+
+    public MessageProcessor(
+        Client client,
+        DatagramSocket clientHandlerSocket,
+        ClientHandler clientHandler
+    ) {
+        this.client = client;
+        this.clientHandlerSocket = clientHandlerSocket;
+        this.clientHandler = clientHandler;
+    }
+
+    public void processMessage(String message) {
+        if (message == null) {
+            return;
+        }
+
+        if (message.equals("/list")) {
+            handleListCommand();
+        } else if (message.equals("DISCONNECT")) {
+            handleDisconnect();
+        }
+    }
+
+    private void handleListCommand() {
+        Server.sendMessage(
+            clientHandlerSocket,
+            Server.getPseudos(),
+            client.getAddress(),
+            client.getPort()
+        );
+    }
+
+    private void handleDisconnect() {
+        System.out.println(
+            "Client deconnection : " + ClientHandler.prettyPrint(client)
+        );
+        Server.removeClientHandler(client.getPseudo());
+        clientHandler.stop();
+    }
+}