add prefix

events/messageCreate.js

@@ -1,11 +1,12 @@
 const { Events } = require("discord.js");
+const getServerPrefix = require("../fonctions/getServerPrefix");
 
 module.exports = {
   name: Events.MessageCreate,
   async execute(message, client) {
-    const prefix = "+";
-
     if (message.author.bot) return;
+
+    const prefix = await getServerPrefix(message.guild.id);
     if (!message.content.startsWith(prefix)) return;
 
     const args = message.content.slice(prefix.length).trim().split(/ +/);