ChopSingle

function unload()
  turtle.back()
  for i = 3, 16 do
    turtle.select(i)
    turtle.dropDown()
  end
  turtle.select(1)
  turtle.forward()
end

function checkFull()
  if turtle.getItemCount(16) > 0 then
    unload()
  end
end

function chopTree()
  turtle.dig()
  turtle.forward()
  while turtle.detectUp() do
    turtle.digUp()
    turtle.up()
  end
end

function backDown()
  while not turtle.detectDown() do
    turtle.down()
  end
  turtle.back()
end

function placeSapling()
  turtle.select(2)
  turtle.place()
  turtle.select(1)
end

function reUp()
  if turtle.getItemCount(1) == 0 then
    turtle.select(1)
    turtle.suckDown()
  elseif turtle.getItemDetail(1).name ~= "minecraft:dye" then
    turtle.select(1)
    turtle.drop()
    turtle.suckDown()
  end
end

function treeGrew()
  local success, data = turtle.inspect()
  if success then
    return data.name == "ic2:rubber_wood" or data.name == "minecraft:log"
  end
end

function growTree()
  repeat
    reUp()
    turtle.place()
  until treeGrew()
end


while true do
  growTree()
  chopTree()
  backDown()
  checkFull()
  placeSapling()
end