Change cell linking method using new Cardinal methods

src/GomokuCell.java

@@ -1,8 +1,7 @@
 import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.List;
-import java.util.Arrays;
+
 /**
  * This class is cell of the board of the Gomoku game.
  */
@@ -137,9 +136,8 @@ public class GomokuCell{
 
     public static void link(GomokuCell c1, GomokuCell c2, Cardinal c1Toc2){
         if (c1 == null || c2 == null) return ;
-        List<Cardinal> cardinals = Arrays.asList(Cardinal.values());
         c1.linkCell(c1Toc2, c2);
-        c2.linkCell(cardinals.get((cardinals.indexOf(c1Toc2) + 4) % 8), c1);
+        c2.linkCell(c1Toc2.inverse(), c1);
     }
 
     //------------------Overides--------------------------