dig stairs to diamond level (no gps)

--don't work by in game download, sorry, still looking how to fix, but if you type it, it works

turtle.refuel(2)

local function CavaBaixo()
    turtle.digDown()
    turtle.down()
end

local function CavaLados()
    turtle.turnLeft()
    turtle.dig()
    turtle.turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.turnLeft()
end

local function CavaFrente()
    turtle.dig()
    turtle.forward()
end

write("how high are we? (Y position) ")

local y = tonumber( read() )
local Num = y-11

for i=1,Num do
    CavaBaixo()
    CavaLados()

    CavaFrente()
    CavaLados()

    CavaFrente()
    CavaLados()

    CavaFrente()
    CavaLados()

    CavaFrente()
    CavaLados()

    turtle.back()
    turtle.back()
    turtle.back()
end