Hello I need to when changing the world and when the player is in world_the_end and when writing /spawn he cleared the inventory and gave items from iremjoin

So its a bit hard to understand what you are wanting.

To me it sounds like you want:
1.) The player's inventory to clear when switching worlds, this can be done via the config.yml under the Clear-Items section. Change the type to ALL to clear all items or leave it as ITEMJOIN for only ItemJoin items. Then set World-Switch to true or define the list of worlds you want their inventory cleared in separated by a comma. Example; World-Switch: world, world_the_nether, world_the_end. Do note: Bypass is enabled for OP players by default so it won't clear their inventory. Set this to DISABLED if you want all players to have their inventories cleared. Also, Options has PROTECT enabled which prevents the clearing of first-join or first-world items. Set this to DISABLED if you wish for those to be cleared.

What you should now have looks like this (you can tweak further settings);

Clear-Items:
  Type: ALL
  Delay-Tick: 2
  Join: DISABLED
  World-Switch: true
  Region-Enter: DISABLED
  Options: PROTECT
  Bypass: DISABLED

2.) The player to be re-given the ItemJoin items. Simply make sure each item in the items.yml has world-switch defined for the triggers of each item. Example; triggers: join, world-switch

Please let me know if this did/didn't answer your issue.
If this did not answer your question, please provide two pastebin.com links, containing your items.yml and config.yml respectively.

EDIT: Closing due to inactivity. Please reopen this issue if you still have questions.