farm tree by anti krisis

k=true
i=0

turtle.dig()
turtle.forward()

while k do
turtle.dig()
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.turnLeft()
turtle.dig()
turtle.turnRight()
turtle.back()
turtle.turnLeft()
if turtle.detectUp() then
turtle.digUp()
turtle.up()
i=i+1
end
if turtle.detectUp()==false then
k=false
end

end

while i>0 do
turtle.down()
i=i-1
end