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The link is http://www.minecraftforum.net/topic/1487712-151162-rotten-flesh-to-leather-hardcore-version-is-up-to-date/
The Recipe is very easy, you put rotten flesh in to the furnace and smelt it, and it will smelt to leather.
Image: http://www.minecraftforum.net/topic/1487712-151162-rotten-flesh-to-leather-hardcore-version-is-up-to-date/
IF there is a bug please reply!