Added invert to Direction

cicaprojekt/Direction.java

@@ -2,4 +2,19 @@ package cicaprojekt;
 
 public enum Direction {
     NORTH, SOUTH, EAST, WEST;
+
+    public static Direction invert(Direction direction) {
+        switch (direction) {
+            case NORTH:
+                return SOUTH;
+            case EAST:
+                return WEST;
+            case SOUTH:
+                return NORTH;
+            case WEST:
+                return EAST;
+            default:
+                return NORTH;
+        }
+    }
 }