update

src/main/java/Snake/Snake.java

@@ -91,6 +91,11 @@ public class Snake {
             this.direction = direction;
     }
 
-
+    public boolean isSelfColliding()
+    {
+        var headPosition = bodySegments.get(0);
+        return bodySegments.stream().anyMatch((point) ->
+                point.equals(headPosition) && point != headPosition);
+    }
 
 }