(WIP) Branch Mine: Staircase

-- 1x2 tunnel for 40 blocks
function stair()
   if turtle.detect() then
      turtle.dig()
   end
   turtle.forward()
   if turtle.detectUp() then
      turtle.digUp()
   end
   if turtle.detectDown() then
      turtle.digDown()
   end
   turtle.down()
end
function stairs()
   for i=1, 40
      stair()
   end
end
-- every 3 blocks, mine left & right 5 blocks