function follow()

turtle.forward()
if not turtle.detectDown() then
    turtle.back()
    turtle.turnLeft()


    if not turtle.forward()or not turtle.detectDown()  then
        turtle.back()
        turtle.back()
    if not turtle.detectDown() then
     return false
     else
     turtle.turnRight()
     turtle.turnRight()
    end
    end
    return true
end
end

while follow do
end