Computercraft Turtle Stein Wand

function checkIfStone()
    local success, data = turtle.inspect()
    if success then
       if data.name == "minecraft:stone" then
           return true
       end
    end
    return false
end

function checkInventory(curSlot)
    if turtle.getItemDetail() == nil or turtle.getItemDetail().name ~= "minecraft:stone" then
        repeat
           curSlot = curSlot + 1
           turtle.select(curSlot)
        until turtle.getItemDetail().name == "minecraft:stone"
    end
    return curSlot
end

function checkFuel(curSlot)
    if turtle.getFuelLevel() ~= "unlimited" and turtle.getFuelLevel() < 1 then
        turtle.select(16)
        while turtle.refuel(0) == false do
            print("Bitte Treibstoff in Slot 16 Füllen!")
            os.sleep(2)
        end
            turtle.refuel(1)
            turtle.select(curSlot)
    end
end

turtle.select(1)
print("Fuel: Slot 16")
print("Stone: Slot 1-15")
print("Höhe: ")
local height = read()
print("Breite (nach rechts):")
local width = read()

curSlot = 1

for i=1, width do
    for j=1, (height-1) do
        checkFuel(curSlot)
        if checkIfStone() == false then
            turtle.dig()
            curSlot = checkInventory(curSlot)
            turtle.place()
        end
        if i%2 == 1 and j ~= height then
            turtle.up()
        end
        if i%2 == 0 and j ~= height then
            turtle.down()
        end
    end
    if checkIfStone() == false then
        turtle.dig()
        curSlot = checkInventory(curSlot)
        turtle.place()
    end
    if i < tonumber(width) then
        turtle.turnRight()
        turtle.forward()
        turtle.turnLeft()
    end
end
if tonumber(width)%2 == 1 then
    for i=0, (height-1) do
        turtle.down()
    end
end