[1.9]Remove Item right after crafting

Crafting Recipe

public class UpgradeRecipe implements IRecipe{

private int stufe = 0;
@Override
public boolean matches(InventoryCrafting inv, World worldIn) {

        List<ItemStack> list1 = Lists.<ItemStack>newArrayList();
        List<ItemStack> list2 = Lists.<ItemStack>newArrayList();
        
	for(int i = 0; i < inv.getSizeInventory(); i++){

		ItemStack itemstack1 = inv.getStackInSlot(i);

		if(itemstack1 != null){

			// Campound cant be null
			if (itemstack1.getItem() instanceof ItemSwordNBT && itemstack1.getTagCompound().getInteger("Stufe") < 10){
				list1.add(itemstack1);
				stufe = itemstack1.getTagCompound().getInteger("Stufe");
			}

			else if (itemstack1.getItem() == Items.diamond){
				list2.add(itemstack1);
			}
			else{
				return false;
			}
		}
	}
	return list1.size() == 1 && list2.size() == 1;
}

@Override
public ItemStack getCraftingResult(InventoryCrafting inv) {
	int random = (int )(Math.random() * 13 + 1);
	random = Math.abs(random - stufe);
	ItemStack stack = new ItemStack(RegisterItem.brokenSword);
	stack.setTagCompound(new NBTTagCompound());
	if(random <= 3){
		stack.getTagCompound().setBoolean("broken", true);
		System.out.println("broken true");
	}
	else{
		stack.getTagCompound().setBoolean("broken", false);
	}
	stack.getTagCompound().setInteger("Stufe", stufe +1);
	return stack;
}

@Override
public int getRecipeSize() {
	return 4;
}

@Override
public ItemStack getRecipeOutput() {
	ItemStack stack = new ItemStack(RegisterItem.brokenSword);
	stack.setTagCompound(new NBTTagCompound());
	stack.getTagCompound().setInteger("Stufe", stufe +1);
	return stack;
}

@Override
public ItemStack[] getRemainingItems(InventoryCrafting inv) {
	ItemStack[] aitemstack = new ItemStack[inv.getSizeInventory()];

        for (int i = 0; i < aitemstack.length; ++i)
        {
            ItemStack itemstack = inv.getStackInSlot(i);
            aitemstack[i] = net.minecraftforge.common.ForgeHooks.getContainerItem(itemstack);
        }

        return aitemstack;
}

}

ItemSword (brokenSword extends this class)

public class ItemSwordNBT extends ItemSword{

public ItemSwordNBT(ToolMaterial material) {
	super(material);
}
@Override
public void onUpdate(ItemStack stack, World worldIn, Entity entityIn, int itemSlot, boolean isSelected) {
	if (stack.getTagCompound() == null){
		stack.setTagCompound(new NBTTagCompound());
	}
	if(!stack.getTagCompound().hasKey("Stufe")){
		stack.getTagCompound().setInteger("Stufe", 0);
	}
}

@Override
public void addInformation(ItemStack stack, EntityPlayer playerIn, List<String> tooltip, boolean advanced) {
	if (stack.getTagCompound() == null){
		stack.setTagCompound(new NBTTagCompound());
	}
	if(stack.getTagCompound().hasKey("Stufe")){
		tooltip.add("Stufe: " + Integer.toString(stack.getTagCompound().getInteger("Stufe")));
	}
	/*if(stack.getTagCompound().hasKey("broken") && stack.getTagCompound().getBoolean("broken")){
		tooltip.add(1,"Broken!!");
	}*/
}