App

To install the appstore app, right-click on your turtle to open the GUI, run pastebin get iXRkjNsG appstore. To install GengZhong8, run appstore get StoneTeacher GengZhong8.
-- https://turtleappstore.com/u/StoneTeacher/a/GengZhong8
os.sleep(3)
turtle.up()

function bz()
    for b = 1,7 do
        turtle.digDown()
        turtle.placeDown()
        turtle.forward()
    end
    turtle.digDown()
    turtle.placeDown()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    for a = 1,7 do
        turtle.digDown()
        turtle.placeDown()
        turtle.forward()
    end
    turtle.digDown()
    turtle.placeDown()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
end

function sf()
    for i = 1,7 do
        turtle.select(2)
        turtle.placeDown()
        turtle.select(3)
        turtle.placeDown()
        turtle.select(4)
        turtle.placeDown()
        turtle.forward()
    end
    turtle.select(2)
    turtle.placeDown()
    turtle.select(3)
    turtle.placeDown()
    turtle.select(4)
    turtle.placeDown()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    for j = 1,7 do
        turtle.select(2)
        turtle.placeDown()
        turtle.select(3)
        turtle.placeDown()
        turtle.select(4)
        turtle.placeDown()
        turtle.forward()
    end
    turtle.select(2)
    turtle.placeDown()
    turtle.select(3)
    turtle.placeDown()
    turtle.select(4)
    turtle.placeDown()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft() 
end

function sg() 
    for s = 1,7 do
        turtle.digDown()
        turtle.forward()
    end
    turtle.digDown()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    for g = 1,7 do
        turtle.digDown()
        turtle.forward()
    end
    turtle.digDown()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
end

turtle.select(1)
for l = 1,4 do
    bz()
end
turtle.turnLeft()

for tr = 1,8 do
    turtle.forward()
end
turtle.turnRight()

for m = 1,4 do
    sf()
end
turtle.turnLeft()

for ztr = 1,8 do
    turtle.forward()
end
turtle.turnRight()

turtle.select(1)
for e = 1,4 do
    sg()
end
turtle.down()