First of all this is EN section and you write in GR.
Second the class that handle's the chat is called Say2.java
There you can add your check (which channel type and which item it consume every time), with a simple
if (Objects.isNull(activeChar.destroyItemById(getClass().getSimpleName(), 57, 100, activeChar, true)))
activeChar.sendMessage("You don't have the proper item(s) to chat.);