update

src/main/java/Snake/Snake.java

@@ -12,6 +12,22 @@ public class Snake {
 
     private SnakeDirection direction;
 
+    private final int gridSize;
 
+    public Snake(int gridSize)
+    {
+        this.gridSize = gridSize;
+        reset();
+    }
+
+    public void reset()
+    {
+        bodySegments.clear();
+        direction = SnakeDirection.UP;
+        Point headLocation = new Point(gridSize/2, gridSize/2);
+        bodySegments.add(headLocation);
+        bodySegments.add(new Point(gridSize/2, gridSize/2 + 1));
+        bodySegments.add(new Point(gridSize/2, gridSize/2 + 2));
+    }
 
 }