Stray quarry

a = 12
b = 0
while b < a do
    turtle.forward()
    b = b+1
end
if b == a and turtle.getItemCount(1) < 1 then
    turtle.select(2)
    turtle.placeUp()
    turtle.select(1)
    turtle.suckUp()
    turtle.select(2)
    turtle.digUp()
    turtle.select(1)
    turtle.placeDown()
    b = 0
end
if b == a and turtle.getItemCount(1) > 0 then
    turtle.placeDown()
    b = 0
end
turtle.select(2)