Wood cutter (CC Turtle)

temptree = 0 -- Pocet pokacenych stromu
y = 1 -- pozice Y
sfuel = 50 -- start fuel

function unload() --unload
    for n = 3,16 do
        local nCount = turtle.getItemCount(n)
        if nCount > 0 then
            turtle.select(n)
            turtle.dropDown()
        end
    end
    turtle.select(1)
end

function compare() -- compare block / turn left
    turtle.select(1)
    while not turtle.compare() do
        turtle.turnLeft()
        sapling() -- check/place sapling
        os.sleep(5)
    end
end

function refueltest() -- check fuel in slot 1
    if turtle.getItemCount(1) == 0 then
        print("Get fuel to slot 1 and press enter")
        event, enter = os.pullEvent("key")
        return
    else
        refueling()
    end
end

function refueling() -- refueling to start fuel level
    while turtle.getFuelLevel() < sfuel do
        turtle.select(1)
        os.sleep(0.2)
        turtle.refuel(1)
        os.sleep(0.2)
    end
end

function moveup() -- move up
    while not turtle.up() do
    turtle.digUp()
    os.sleep(0.5)
    end
end

function compareup() -- compare/move up
    refueltest()
    turtle.select(1)
    while turtle.compareUp() do
        moveup()
        y = y + 1
        os.sleep(0.5)
    end
end

function movedown() -- move down
    while not turtle.down() do
    turtle.digDown()
    os.sleep(0.5)
    end
end

function moveback() -- move back
    while y > 1 do
    movedown()
    y = y - 1
    os.sleep(0.2)
    end
end

function sapling() -- place sapling
    turtle.select(16)
    if turtle.compare() == true then
        turtle.select(2)
        turtle.place()
        turtle.select(1)
        os.sleep(0.2)
    else
        turtle.select(1)
        os.sleep(0.2)
    end
end

function cutter() -- PROGRAM CORE
    if turtle.getItemCount(2) == 0 then -- check sapling slot before start
        print("Cutted trees: "..temptree)
        print("Get sapling to slot 2 and press key or press key to exit")
        print("or press key to exit")
        event, enter = os.pullEvent("key")
        if turtle.getItemCount(2) == 0 then
            os.reboot()
            else
            print("Continue cutting")
        end
        return
    end

    compare() -- Wait for tree

    if turtle.getFuelLevel() == 0 then
    refueltest()
    end

    while not turtle.forward() do -- Try forward
    turtle.dig()
    os.sleep(0.5)
    end

    compareup() -- cutting tree
    moveback() -- move down

    while not turtle.back() do -- move start position
        turtle.turnLeft()
        turtle.turnLeft()
        os.sleep(0.2)
        turtle.dig()
        turtle.turnLeft()
        turtle.turnLeft()
        os.sleep(0.2)
    end

    sapling() -- check/place sapling
    unload() -- unload
    temptree = temptree + 1 -- counting cutted tree
end

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print("Place chest under turtle, get to slot 1 a few fuel & slot 2 a few sapling's")

while true do
    cutter()
end

print("Pocet pokacenych stromu: "..temptree)