Booster track helper

local running = true

local iterator = 0
local second = 0

while running do
   if(iterator >= 16) then
      if(second < 8) then
         turtle.digDown()
         second = second + 1
      end
   end

   iterator = iterator + 1

   if(iterator == 24) then
      iterator = 0
      second = 0
   end

   running = turtle.forward()
end