Chop

function FindTree
  turtle.select(1)
  if turtle.compare() == true then
        return true
  else
        return false
  end
end

function cut
  while turtle.detectUp() do
  turtle.digUp()
  turtle.up()
end
  while not turtle.detectDown() do
  turtle.down()
end

function plant()
  turtle.select(16)
  turtle.place()
end

function fuel()
  if turtle.getFuelLevel <10 then
  turtle.select(15)
  turtle.refuel(1)
end

fuel()
plant()
fuel()
if findTree() == false then
  cut()
else
  print ("error")