WallReplacer

c = 13
for i=1,4 do
    turtle.select(c)
for i=1,5 do
for i=1,12 do
    turtle.dig()
    turtle.place()
    turtle.turnRight()
    if turtle.detect() == false then
        turtle.forward()
        turtle.turnLeft()
    end
end
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.down()
 for i=1,12 do
    turtle.forward()
 end
 turtle.turnRight()
 end
    if c < 16 then
     c = c + 1
    end
end