test

function countdown()
 monitor.clear()
 monitor = peripheral.wrap("left")
 monitor.setCursorPos(1,1)

 local m = 59
 local s = 60

 repeat
  if m > 0 then
   if s > 0 then
    s = s - 1
   else
     j = 59
     m = m - 1
    end
  else
   if s > 0 then
     s = s - 1
   end
  end
   monitor.setCursorPos(1,1)
   monitor.write("La turtle parte tra:")
   monitor.setCursorPos(2,1)
   monitor.write(m..":"..s)

 until m == 0 and s == 60
 sleep(1)
 monitor.clear()
 monitor.setCursorPos(4,1)
 monitor.write("Turtle partita")
end