diff --git a/class.towers.php b/class.towers.php
deleted file mode 100644
index 9ebed35..0000000
--- a/class.towers.php
+++ /dev/null
@@ -1,220 +0,0 @@
-<?php
-
-class Tower{
-  private $tower0;
-  private $tower1;
-  private $tower2;
-  public $discsCount;
-  
-  /* on the hannoi tower
-  */
-  public function __construct($discsCount,$towerArr = array()){
-    $this->discsCount = $discsCount;
-    if(empty($towerArr)){
-
-        //starting position for the tower
-        $this->tower0 = array();
-        for ( $i = $this->discsCount - 1 ;$i > -1 ; $i-- ){
-        $this->tower0[] = $i;
-        }
-        $this->tower1 = array();
-        $this->tower2 = array();
-    }else{    
-        $this->tower0 = $towerArr[0];
-        $this->tower1 = $towerArr[1];
-        $this->tower2 = $towerArr[2];
-    }
-  }
-  
-  public function __toString(){
-      return json_encode($this->get_tower_array());
-  }
-
-
-  public function list_moves_availables(){
-    $movesAvailables = array();
-    for( $i = 0; $i < 3; $i++ ){
-      for( $j = 0; $j < 3; $j++ ){
-        $move = Move::make($i,$j);
-        if(($move !== false) && ($this->check_if_move_is_available($move))){
-          $movesAvailables[] = $move;
-        }
-      }
-    }
-    return $movesAvailables;
-  }
-  
-  public function get_tower_array(){
-    return array(
-      $this->tower0,
-      $this->tower1,
-      $this->tower2
-    );
-  }
-  private function check_if_move_is_available(Move $move){
-    if($move === false){
-      return false;
-    }
-    $fromTower = "tower".$move->from;
-    $toTower = "tower".$move->to;
-    if( (!empty($this->{$fromTower}))
-        &&(   (end($this->{$toTower}) > end($this->{$fromTower}))
-              ||(empty ($this->{$toTower}))
-          )
-    ){
-        return true;
-    }
-    return false;
-  }
-  
-  public function add_move(Move $move){
-    if($this->check_if_move_is_available($move)){
-        $towerArr = $this->get_tower_array();
-        $towerArr[$move->to][] = end($towerArr[$move->from]);
-        array_pop($towerArr[$move->from]);
-        return new Tower( $this->discsCount, $towerArr );
-    }
-    return false;
-  }
-  public function is_won(){
-    $arr = $this->get_tower_array();
-    if ((empty($arr[0]) && empty($arr[1]))
-        ||(empty($arr[0]) && empty($arr[2]))){
-          return true;
-    }
-    return false;
-  }
-  
-}
-class Move{
-
-    private static $from0to1 = 0;
-    private static $from0to2 = 1;
-    private static $from1to0 = 2;
-    private static $from1to2 = 3;
-    private static $from2to0 = 4;
-    private static $from2to1 = 5;
-    
-    public $from;
-    public $to;
-    
-    private $value;
-    
-    public function __construct(){
-        $this->value = 0;
-    }
-    
-  private function  set_value($value){
-    $this->value = $value;
-    switch ($value){
-      case Move::$from0to1:
-        $this->from = 0;
-        $this->to = 1;
-        break;
-      case Move::$from0to2:
-        $this->from = 0;
-        $this->to = 2;
-        break;
-      case Move::$from1to0:
-        $this->from = 1;
-        $this->to = 0;
-        break;
-      case Move::$from1to2:
-        $this->from = 1;
-        $this->to = 2;
-        break;
-      case Move::$from2to0:
-        $this->from = 2;
-        $this->to = 0;
-        break;
-      case Move::$from2to1:
-        $this->from = 2;
-        $this->to = 1;
-        break;
-      default:
-        return false;
-        break;
-    }
-  }
-  public function __toString(){
-    switch($this->value){
-      case Move::$from0to1:
-        return "from col 0 to 1";
-        break;
-      case Move::$from0to2:
-        return "from col 0 to 2";
-        break;
-      case Move::$from1to0:
-        return "from col 1 to 0";
-        break;
-      case Move::$from1to2:
-        return "from col 1 to 2";
-        break;
-      case Move::$from2to0:
-        return "from col 2 to 0";
-        break;
-      case Move::$from2to1:
-        return "from col 2 to 1";
-        break;
-      default:
-        return false;
-        break;
-    }
-  }
-  public static function make($from,$to){
-    $move = new Move();
-    if(($from == 0) && ($to == 1))
-      $move->set_value(Move::$from0to1);
-    elseif(($from == 0) && ($to == 2))
-      $move->set_value(Move::$from0to2);
-    elseif(($from == 1) && ($to == 0))
-      $move->set_value(Move::$from1to0);
-    elseif(($from == 1) && ($to == 2))
-      $move->set_value(Move::$from1to2);
-    elseif(($from == 2) && ($to == 0))
-      $move->set_value(Move::$from2to1);
-    elseif(($from == 2) && ($to ==1))
-      $move->set_value(Move::$from2to1);
-    else
-      return false;
-    
-    return $move;
-  }
-}
-class Steps{
-  /*
-  *Memorise the differents towers configurations
-  */
-  private $steps;
-  public function __construct(){
-    $this->steps = array();
-  }
-  
-  private function convert_column_to_int($column,$base){
-    $exp = 0;
-    $total = 0;
-    foreach($column as $elem){
-      $total =$total + ($elem + 1) * pow( $base + 1 , $exp );
-      $exp++;
-    }
-    return $total;
-  }
-  
-  private function convert_tower_to_int(Tower $tower){
-    $arrTower = $tower->get_tower_array();
-    return
-      $this::convert_column_to_int($arrTower[0],$tower->discsCount) +
-      $this::convert_column_to_int($arrTower[1],$tower->discsCount) * pow(10,$tower->discsCount) +
-      $this::convert_column_to_int($arrTower[2],$tower->discsCount) * pow(10,2 * $tower->discsCount);
-  }
-
-  public function add_step(Tower $tower){
-    $towerValue = $this::convert_tower_to_int($tower);
-    if(in_array($towerValue,$this->steps)){
-      return false;      
-    }else{
-      $this->steps[] = $towerValue; 
-      return true;
-    }
-  }
-}