uranium depletion

reactor = peripheral.wrap("left")
chest = peripheral.wrap("right")
while rs.getInput("bottom") do
local i = 1
rs.setOutput("top", true)
repeat
  print("Checking slot: ")
  sleep(1)
  print(i)
  if reactor.getStackInSlot(i)~=nill then
    if reactor.getStackInSlot(i).name=="reactorUraniumSimple" then
	  print("FILLED")
      sleep(1)
    end

    if reactor.getStackInSlot(i).name=="reactorUraniumSimpledepleted" then
	  print("DEPLETED")
      sleep(1)
      print("REMOVING DEPLETED")
      reactor.pushItem("down",i)
      sleep(1)
      print("REPLACING WITH FRESH CELL")
      reactor.pullItem("up",2,1,i)
      sleep(1)
    end
  end
  if reactor.getStackInSlot(i)==nill then
    print("EMPTY")
    sleep(1)
    print("REPLACING WITH FRESH CELL")
    reactor.pullItem("up",2,1,i)
    sleep(1)
  end


  i = i + 2
until i == 55
end
rs.setOutput("top",false)