Baum

function forward()
    while(turtle.forward()==false) do
        turtle.dig()
      end
end

function up()
      while(turtle.up()==false)
           do turtle.digUp()
      end
end

forward()
while(turtle.detectUp()) do
  up()
end
while(turtle.detectDown()==false) do
  turtle.down()
end
turtle.back()