This mod adds an uncrafting table.
It is crafted by surrounding a crafting table with 8 blocks of iron in a crafting table.
The uncrafting table uncrafts items into the materials that they are crafted from.
Pictures and some more details can be found here: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/wip-mods/3032965-uncrafting-table