Few correction on the number direction freedom heuristic

AI/src/heuristics/number_direction_freedom_heuristic.cpp

@@ -51,11 +51,11 @@ namespace mcts
   for(uint8_t i=0; i< 4; i++) { 
     number_of_direction_after+= number_of_direction_penguin(penguins[i]);
   }
-  std::cout << "number of direction  : " << "("+std::to_string(number_of_direction_after)+" : " + std::to_string((number_of_direction_after - 12.0)/24.0)+")" <<std::endl;
+  std::cout << "number of direction  : " << "("+std::to_string(number_of_direction_after)+" : " + std::to_string((number_of_direction_after - 12.0)/12.0)+")" <<std::endl;
 
 
   // Return a float between -1.0 and 1.0 related to the change of the number of direction in which you can play before and after the move
-  return ((number_of_direction_after - 12.0)/24.0);
+  return (-(number_of_direction_after - 12.0)/12.0);
   //return (-(number_of_direction_after - number_of_direction_before)/12.0);
   }