View difference between Paste ID: WmrvYj9W and eVF7kit2

 rednet.open("left")
 for i = 1, 16 do -- loop through the slots
   turtle.select(i) -- change to the slot
   if turtle.refuel(0) then -- if it's valid fuel
     local halfStack = math.ceil(turtle.getItemCount(i)/2) -- work out half of the amount of fuel in the slot
     turtle.refuel(halfStack) -- consume half the stack as fuel
   end
 end
 print("This turtle is under my control!")
 while true do
   id, msg = rednet.receive()
   if msg == "w" then
     turtle.forward()
   end
   if msg == "a" then
     turtle.turnLeft()
   end
   if msg == "s" then
     turtle.back()
   end
   if msg == "d" then
     turtle.turnRight()
   end
   if msg == "e" then
     turtle.up()
   end
   if msg == "q" then
     turtle.down()
   end
 end