1-3-1 cutTree

function cut()
   while turtle.detectUp() do
      turtle.digUp()
      turtle.up()
      turtle.dig()
      for i=1, 3 do
         turtle.turnLeft()
         turtle.dig()
      end
   end
   while not turtle.detectDown() do
      turtle.down()
   end
   turtle.back()
end

--GP--

if turtle.dig() then
   print ("Započinjem sijecu.")
   turtle.forward()
   turtle.dig()
   turtle.forward()
   turtle.dig()
   for i=1, 3 do
      turtle.turnLeft()
      turtle.dig()
   end
   cut()
   else
      print ("Drvo nije pronadjeno.")
end