help with coding

I'm trying to create a mod that puts the player in difficulty when he tries to break a block of wood and if he doesn't have an ax he gets nothing.
I wrote this code but it gives me error 

@Mod.EventBusSubscriber
public class Woodprocedure {

   @SubscribeEvent
   public static void harvestCheck(PlayerEvent.BreakSpeed ​​event) {
       BlockState block = event.getState();

       // Check if the block is a trunk (log)
       if (block.getBlock().getRegistryName().getPath().contains("log")) {
           PlayerEntity player = event.getPlayer();
           ItemStack item = player.getHeldItemMainhand();

           // Check if the object in your hand is not an axe
           if (!(item.getItem() instanceof AxeItem)) {
               event.setCanceled(true);
           }
       }
   }
}