TD-5: Cleanup and Finalizing

src/main/java/de/towerdefence/server/server/channels/match/MatchWebsocketHandler.java

@@ -101,8 +101,11 @@ public class MatchWebsocketHandler extends JsonWebsocketHandler {
         objectMapper.readValue(payload, RequestTowerPlacingMessage.class);
         Player opponent;
         try {
-            opponent =
+            opponent =this.matchService.placeTower(
-            this.matchService.placeTower(this.sessionPlayers.get(session), msg.getX(), msg.getY());
+                this.sessionPlayers.get(session),
+                msg.getX(),
+                msg.getY()
+            );
         } catch (InvalidPlacementException exception) {
             new InvalidPlacementMessage(msg.getX(), msg.getY(), exception.getReason()).send(session);
             return;