Leather Craft mod allows you to create leather by smelting rotten flesh. It basically adds a recipe for it.
You can use this mod without any library or other mod. Thanks for reading.
NOTE : If file name contains FABRIC it's for Fabric but if it isn't contains FABRIC it's Forge... Also you can see it by clicking files under Supported Modloader Versions
Craft of Leather (For mod version 1.0.0)