public ItemStack splitStack(int i, int j) {
        if (this.a[i] != null) {
            ItemStack itemstack;

            if (this.a[i].count <= j) {
                itemstack = this.a[i];
                this.a[i] = null;
                return itemstack;
            } else {
                itemstack = this.a[i].a(j);
                if (this.a[i].count == 0) {
                    this.a[i] = null;
                }

                return itemstack;
            }
        } else {
            return null;
        }
    }