added one step button

src/main/java/controller/Controller.java

@@ -27,8 +27,6 @@ public class Controller {
 
   public static final int PERIOD_IN_MILLISECONDS = 50;
   @FXML
-  private Button restartButton;
-  @FXML
   private ToggleButton pauseToggleButton;
   @FXML
   private ToggleButton playToggleButton;
@@ -123,4 +121,8 @@ public class Controller {
     repaintBoard();
   }
 
+  public void oneStepButtonAction(ActionEvent actionEvent) {
+    this.pause();
+    updateBoard();
+  }
 }
\ No newline at end of file

src/main/java/model/FirefighterBoard.java

@@ -88,7 +88,7 @@ public class FirefighterBoard implements Board<List<ModelElement>> {
       List<Position> neighborFirePositions = neighbors(newFirefighterPosition).stream().filter(firePositions::contains).toList();
       for(Position firePosition : neighborFirePositions)
         extinguish(firePosition);
-      result.addAll(firePositions);
+      result.addAll(neighborFirePositions);
     }
     firefighterPositions = firefighterNewPositions;
     return result;

src/main/resources/view/view.fxml

@@ -13,6 +13,9 @@
     <Button fx:id="restartButton" maxHeight="-Infinity" maxWidth="-Infinity"
             mnemonicParsing="false" onAction="#restartButtonAction" prefHeight="24.0" prefWidth="200.0"
             text="Restart"/>
+    <Button fx:id="oneStepButton" maxHeight="-Infinity" maxWidth="-Infinity"
+            mnemonicParsing="false" onAction="#oneStepButtonAction" prefHeight="24.0" prefWidth="200.0"
+            text="One step"/>
     <ToggleButton fx:id="playToggleButton" maxHeight="-Infinity" maxWidth="-Infinity"
                   mnemonicParsing="false" onAction="#playToggleButtonAction" prefHeight="24.0"
                   prefWidth="200.0" styleClass="button" text="Play"/>