CSremover

function isBadBlock()
    if not(turtle.detect()) then
        return false
    end
    for slot=1,2,1 do
        turtle.select(slot)
        if turtle.compare() then
            return true
        end
    end
    return false
end

function isBadBlockDown()
    if not(turtle.detectDown()) then
        return false
    end
    for slot=1,2,1 do
        turtle.select(slot)
        if turtle.compareDown() then
            return true
        end
    end
    return false
end

function checkSides()
    turtle.turnRight()
    if isBadBlock() then
        turtle.dig()
    end
    turtle.turnLeft()
    if isBadBlock() then
        turtle.dig()
    end
    turtle.turnLeft()
    if isBadBlock() then
        turtle.dig()
    end
    turtle.turnRight()
end

function goForward()
    while not(turtle.forward()) do
        turtle.attack()
    end
end
function goDown()
    while not(turtle.down()) do
        turtle.attackDown()
    end
end
function goUp()
    while not(turtle.up()) do
        turtle.attackUp()
    end
end

function main()
    curHeight = 0
    while true do
        checkSides()
        while (not(turtle.detectDown()) or isBadBlockDown()) and (curHeight>-10) do
            turtle.digDown()
            goDown()
            curHeight = curHeight-1
            checkSides()
        end
        if not(turtle.detect()) or isBadBlock() then
            turtle.dig()
            goForward()
        else
            while turtle.detect() and not(isBadBlock()) do
                turtle.digUp()
                goUp()
                curHeight = curHeight+1
            end
            checkSides()
            goForward()
        end
    end
end

main()