Help with an enchantment transfer table

Alright, so I'm making an enchantment transfer table (basically moves enchantments from an item to a book), and I've got it mostly working except that it doesn't apply the enchantments on the weapon/item to the book. Here is a screenshot of the procedure:

I also am editing the "remove specific enchantment" in the code to remove all of the enchantments from the item/weapon.

The only thing I can think of is that enchantments are stored as a number or logic NBT instead of text. But I can't find any info on it online.