Simple Clearing Program

function level()
    for i=0,19,1 do
        row()
        if i~=19 then
            if i%2==0 then
                turtle.turnRight()
                turtle.dig()
                turtle.forward()
                turtle.turnRight()
            else
                turtle.turnLeft()
                turtle.dig()
                turtle.forward()
                turtle.turnLeft()
            end
        end
    end
    nextLevel()
end

function row()
    for j=0,18,1 do
        turtle.dig()
        turtle.forward()
    end
end

function nextLevel()
    turtle.turnRight()
    turtle.digUp()
    turtle.up()
end

function main()
    for n=0,1,1 do
        level()
    end
end

main()