Carpet Duplication Using Slimeblocks and pumpkins in 1.11

it was showed by Myren Eario on his tnt duplication video http://www.youtube.com/watch?v=qkSLYcPAhWI&list=PLIRR9clro4hRjpNnI46YvEon4oeWbJRV4

using this method you can get infinite carpet and essentially infinite fuel in 1.11 which is really over powered .
the concept was shown by my friend madcat :
http://www.youtube.com/watch?v=bp5fuhm8-20