fortune skript

[orunt]

on mine:
  if gamemode of player is survival:
    if player is in world "world":
      set {_fortune} to the level of fortune on player's tool
      set {_no_bonus_chance} to 2 / ({_fortune} + 2)
      set {_rand_pick} to a random number between 0 and 1
      set {_num_drops} to 1
      if {_rand_pick} is greater than {_no_bonus_chance}:
        set {_num_drops} to a random integer between 2 and ({_fortune} + 1)
      clear drops

this is a fortune skript i stole it outta somewhere and i can't manage to find the original creator