Computercraft Tree Farm

i = 0
y = 0

function turnRight(times)
  repeat
    turtle.turnRight()
    i = i + 1
  until i == times
  i = 0
end

function forward(times)
  repeat
    turtle.forward()
    i = i + 1
  until i == times
  i = 0
end

function itemdrop()
  if y > 0 then
    repeat
      if turtle.down() == true then
        y = y - 1
      else
        turtle.digDown()
      end
    until y == 0
  end
    turnRight(2)
    forward(3)
    i = 1
    repeat
      turtle.select(i)
      items = turtle.getItemCount(i)
      if items > 0 then
        repeat
          turtle.drop()
          items = items - 1
        until items == 0
      end
      i = i + 1
    until i == 16
    i = 0
    turnRight(2)
    forward(3)
end

while true do
if turtle.detect() == true then
  boo, block = turtle.inspect()
  if block.name == "minecraft:log" then
    turtle.dig()
    turtle.digUp()
    turtle.up()
    y = y + 1
  elseif block.name == "minecraft:sapling" then
    fuel = turtle.getFuelLevel()
    if fuel < 50 then
      turnRight(2)
      forward(3)
      turnRight(1)
      forward(1)
      turtle.select(15)
      repeat
        turtle.suckDown()
        turtle.refuel()
        i = i + 1
      until i == 5
      i = 0
      turnRight(2)
      forward(1)
      turnRight(3)
      forward(3)
    end
    sleep(30)
  else
    itemdrop()
  end
else
    if turtle.detectDown() == false then
        turtle.up()
        repeat
            suc, block = turtle.inspect()
            turtle.dig()
            turtle.digUp()
            turtle.up()
        until suc == false
        repeat
            turtle.down()
        until turtle.detectDown() == true
        y = 0
        itemdrop()
    else
        turtle.select(16)
        turtle.place()
    end
end
end