platform.lua

turtle.refuel()

function replace()
    turtle.digDown()
    item = turtle.getItemDetail()
    if item ~= nil then
        if item.name ~= "minecraft:stone" or item.damage ~= 5 then
            turtle.select(turtle.getSelectedSlot()+1)
        end
    else
        turtle.select(turtle.getSelectedSlot()+1)
    end
    turtle.placeDown()
end

for x = 1, 12 do
    for y = 1, 12 do
        a, b = turtle.inspectDown()
        if a then
            if b.state.variant ~= "andesite" then
                replace()
            end
        else
            replace()
        end
        turtle.forward()
    end
    if x % 2 == 1 then
        turtle.turnRight()
        turtle.forward()
        turtle.turnRight()
    else
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
    end
    turtle.forward()
end