minor adjustments to checkBarriers(), now properly checks for obstacles

src/RumbleBot.java

     protected char nextMove(View view)
     {
         checkBarriers(view);
-        return walk();
-    }
-
-    //@TODO: add walk() logic
-    private char walk() 
-    {
+        if (inDanger(view))
+        {
+            //run away
+        }
         if(moves.isEmpty())
         {
             moves += ' ';
         int rightIndex = centerIndex + 1;
 
 
-        //these need to be changed to account for obstacles etc.
-        frontIsBlocked = view.data.charAt(frontIndex) == '*';
-        backIsBlocked = view.data.charAt(backIndex) == '*';
-        leftIsBlocked = view.data.charAt(leftIndex) == '*';
-        rightIsBlocked = view.data.charAt(rightIndex) == '*';
+        
+        frontIsBlocked = view.data.charAt(frontIndex) == '~' || view.data.charAt(frontIndex) == '#' || view.data.charAt(frontIndex) == 'X';
+        backIsBlocked = view.data.charAt(backIndex) == '~' || view.data.charAt(frontIndex) == '#' || view.data.charAt(frontIndex) == 'X';
+        leftIsBlocked = view.data.charAt(leftIndex) == '~' || view.data.charAt(frontIndex) == '#' || view.data.charAt(frontIndex) == 'X';
+        rightIsBlocked = view.data.charAt(rightIndex) == '~' || view.data.charAt(frontIndex) == '#' || view.data.charAt(frontIndex) == 'X';
         trapped = frontIsBlocked && backIsBlocked && leftIsBlocked && rightIsBlocked;
     }
 }