This is a very simple data pack that allows you to craft rotten flesh into Leather. Rather than just making a simple campfire or furance recipe I thought I'd make it a little more in depth with crafting. Taking four pieces of rotten flesh, along with four pieces of string, and one piece of coal or charcoal in the middle allows you to stitch together and dry the rotten flesh to become useable leather.
The leather created is 1 to 1 of the amount of Rotten flesh, but I don't feel that's too bad since you still need string and charcoal in order to produce it. Feel free to leave comments or suggestions!

Credits: misode.github.io was used to create the Datapack.
Feel free to use in mod pack, or edit it. It's a very simple datapack.