Ajout de la classe EmptySquare

src/main/java/model/EmptySquare.java

+package model;
+
+import util.Position;
+
+public class EmptySquare implements Entity{
+
+    private Position position;
+    public EmptySquare(Position p){
+        this.position = p;
+    }
+    @Override
+    public void nextTurn(Board<Entity> board) {
+        return;
+    }
+
+    @Override
+    public Position getPosition() {
+        return position;
+    }
+
+    @Override
+    public void setPosition(Position p) {
+        this.position = p;
+    }
+    
+}

src/main/java/model/FirefighterBoard.java

@@ -20,7 +20,7 @@ public class FirefighterBoard implements Board<List<ModelElement>> {
   private final TargetStrategy targetStrategy = new TargetStrategy();
   private List<Position> firefighterPositions;
   private Set<Position> firePositions;
-  private Map<Position, List<Position>> neighbors = new HashMap();
+  private Map<Position, List<Position>> neighbors = new HashMap<Position, List<Position>>();
   private final Position[][] positions;
   private int step = 0;
   private final Random randomGenerator = new Random();