Turtle Builder: Cactus Farm

-- Slot 1: Cobble
-- Slot 2: Sand
-- Slot 3: Cactus

local i = 0
while(i<32)
{
turtle.select(1)
turtle.placeDown()
turtle.up()
turtle.select(2)
turtle.placeDown()
turtle.up()
turtle.select(3)
turtle.placeDown()
turtle.up()
turtle.up()
i = i + 1
}
turtle.forward()
turtle.forward()
i = 0
while(i<128)
{
turtle.down()
i = i + 1
}