Solved gen upgrading

[Zach20]

Hello! I'm Zach20 and i'm trying to figure out how to skript in a system where a player can upgrade a gen from tier 1 to tier 2, but i can't figure out how to remove the old gen and the cost of upgrading it from the player.
Skript Version: Skript 2.4
Skript Author: Bensku
Minecraft Version 1.15.2
here's my skript:

on left click:
  if player's held item is music disc 13:
    wait 1 tick
    open chest with 1 row named "&7&lStarter Gen" to player
    wait 1 tick
    format slot 6 of player with diamond named "&a&lUpgrade Gen" to close then run [execute console command "/1genupgrade %player%"]

command /1genupgrade <player>:
  trigger:
    if player has 128 cobblestone and 128 coal:
      give 1 music disc cat named "&9&lTier 2 Gen" to arg-1
      remove 128 cobblestone from arg-1
      remove 128 coal from arg-1
      remove music disc 13 from arg-1
    else:
      send "&c&lSorry! You dont have the resources to upgrade this gen!"

if anyone can help me on this, it would be much appreciated

 

[Potato]

command /1genupgrade <player>:
  trigger:
    if player's inventory contains 128 cobblestone and 128 coal:
      give arg-1 1 music disc cat named "&9&lTier 2 Gen"
      remove 128 cobblestone from arg-1's inventory
      remove 128 coal from arg-1's inventory
      remove music disc 13 from arg-1's inventory
    else:
      send "&c&lSorry! You dont have the resources to upgrade this gen!"

This should work

 

[Zach20]

command /1genupgrade <player>:
  trigger:
    if player's inventory contains 128 cobblestone and 128 coal:
      give arg-1 1 music disc cat named "&9&lTier 2 Gen"
      remove 128 cobblestone from arg-1's inventory
      remove 128 coal from arg-1's inventory
      remove music disc 13 from arg-1's inventory
    else:
      send "&c&lSorry! You dont have the resources to upgrade this gen!"

This should work

Thank You so much! it works

 

[Potato]

Thank You so much! it works

No proplem at all