on rightclick on chest:
	if block under event-block is barrier:
		cancel event
		open chest with 1 rows named "&a&lTrade" to player
		set slot 0 of player's current inventory to stone named "&7&lStein &f&l➜ &7&lStein"

on inventory click:
	if name of event-item contains "&7&lStein &f&l➜ &7&lStein":
		cancel event
		if amount of stone in player's inventory is more than 0.1:
			remove 1 stone from player's inventory
			give 1 stone named "&7Stein" to player's inventory
			stop trigger
		else:
			send "&cDu hast keinen Stein" to player

on place stone:
	if name of event-block is not "&7Stein":
		cancel event