Here is a more blocks cheat
First place what you want to double in a chest, then exit the chest, then go back in the chest and take the items you want to double out again then place the items you want to double. Then exit minecraft then go to your multitasking bar and delete minecraft, then go back to minecraft and look in your chest and the items should be in there and on the ground, so you get double the amount that you had before!
P.S This doesnt work with wool. If this cheat doesn't work then leave a comment about what went wrong
Kitty's forever!!??????????