@SubscribeEvent
    public void pickupÎtemBag(PlayerEvent.ItemPickupEvent event)
    {



            PlayerEntity player = event.getPlayer();

            if(event.getStack().getItem() == Items.COBBLESTONE){

                if(player.inventory.hasItemStack(new ItemStack(ItemInit.cobblestone_bag))){

                    player.inventory.deleteStack(new ItemStack(Items.COBBLESTONE));

                    for(ItemStack itemStack : player.inventory.mainInventory) {

                        if(itemStack.getItem() == ItemInit.cobblestone_bag){

                            CompoundNBT nbt = itemStack.getOrCreateTag();

                            nbt.putInt("cobblestone", nbt.getInt("cobblestone") + event.getStack().getCount());

                            break;

                        }


                    }

                }

            }




    }