Added task descriptions and removed walkByColumns and walkByCircles

src/RumbleBot.java

     }
 
     protected char nextMove(View view){
-        return walk(); //@TODO Add nextMove() logic
+        return walk(); //@TODO: add nextMove() logic
     }
 
     private char walk(){
         if(moves.isEmpty()){
-            moves += ' '; //@TODO Add walk() logic
+            moves += ' '; //@TODO: add walk() logic
         }
         char nextMove = moves.charAt(0);
         moves = moves.substring(1);

src/SnakeBot.java

     protected SnakeBot(String[] args) {
         super(args);
     }
-    //@TODO Find a better way to avoid collectedStones
+    //@TODO: find a better way to avoid collectedStones
     protected char nextMove(View view){
         boolean stoneDetected = view.data.contains("@");
         char nextMove;