Update server.py

server.py

@@ -38,7 +38,10 @@ async def party_server(websocket: WebSocket):
 
     await websocket.send_text("[system]:Enter your name to start.")
     data = await websocket.receive_text()
-    username = data
+    if data.lower() == "system":
+        await websocket.send_text("[system]:You can't set system as your name")
+        return
+    username = data.lower()
 
     users[username] = User(username, websocket, "user")