Turtle Minecraft ComputerCraft

-- Start with Redstone Signal

term.clear()
term.setCursorPos(1,1)
print("Recuerda Poner un EnderChest en el primer casillero del turtle")
term.setCursorPos(1,6)
print("Para encender el turtle, tienes que darle un tick de redstone")
os.pullEvent("redstone")


----------------------------

x = 0
y = 0
z = 0

a = 30
b = 30
c = 30

isRunning = true
isLeft = true
isFinishCycle = false

function turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
end

function turnLeft()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
end

function digDown()
    turtle.digDown()
    turtle.down()
    turtle.turnLeft()
    turtle.turnLeft()
end

function ivFull()
    if turtle.getItemCount(16) ~= 1 then
        return false
    end
    return true
end

function transferBase()
    turtle.digUp()
    turtle.select(1)
    turtle.placeUp()

    for i = 2,16 do
        turtle.select(i)
        turtle.dropUp()
    end

    turtle.select(1)
    turtle.digUp()
end

while isRunning do

    if ivFull() then
        transferBase()
    end

    if x == a and z == b then
        isFinishCycle = true
    end

    if x == a then
        if isFinishCycle then
            if y ~= c then
                digDown()
                isFinishCycle = false
                isLeft = not isLeft
                z = 0
                y = y + 1
            else
                break
            end
        else
            if isLeft then
                turnRight()
            else
                turnLeft()
            end
            z = z + 1
        end

        isLeft = not isLeft
        x = 0

    else
        turtle.dig()
        turtle.forward()

        x = x + 1
    end
end