fix: PR issues fixed

modules/core/src/main/scala/de/nowchess/chess/engine/GameEngine.scala

@@ -218,4 +218,3 @@ class GameEngine extends Observable:
           "Illegal move."
         ))
 
-end GameEngine

modules/core/src/test/scala/de/nowchess/chess/command/CommandInvokerBranchTest.scala

@@ -214,4 +214,3 @@ class CommandInvokerBranchTest extends AnyFunSuite with Matchers:
     invoker.execute(cmd3)  // While loop condition should be false, no iterations
     invoker.history.size shouldBe 3
 
-end CommandInvokerBranchTest

modules/core/src/test/scala/de/nowchess/chess/command/CommandInvokerTest.scala

@@ -121,4 +121,3 @@ class CommandInvokerTest extends AnyFunSuite with Matchers:
     invoker.history(1) shouldBe cmd3
     invoker.getCurrentIndex shouldBe 1
 
-end CommandInvokerTest

modules/core/src/test/scala/de/nowchess/chess/command/CommandTest.scala

@@ -50,4 +50,3 @@ class CommandTest extends AnyFunSuite with Matchers:
     val cmd = ResetCommand()
     cmd.description shouldBe "Reset board"
 
-end CommandTest

modules/core/src/test/scala/de/nowchess/chess/engine/GameEngineTest.scala

@@ -275,4 +275,3 @@ class GameEngineTest extends AnyFunSuite with Matchers:
     override def onGameEvent(event: GameEvent): Unit =
       events += event
 
-end GameEngineTest