Turtle Dig

local distance = ...
     if distance ~= nil then
          distance = tonumber(distance)
          for i = 1, distance do
               if turtle.forward() then
                    turtle.digUp()
                    print("Turtle moved forward.")
               else
                    turtle.dig()
                    turtle.forward()
                    turtle.digUp()
                    print("Turtle destroyed blocks.")
               end
          end
     else
          print("Did not speficy distance.")
     end