JavaScript Discord Error, TypeError: client.handleCommands is not a function

Hello guys so I’m experiencing this problem with Discord bot making in JavaScript.
I’m following a tutorial from Fusion Terror.
The error I’m experiencing is that it’s saying handleCommands.js is not a function, it works for him but not for me.

Full error:

~@~: workspace/project_name$ node .
/home/username/workspace/project_name/src/bot.js:26
client.handleCommands();
       ^

TypeError: client.handleCommands is not a function
    at Object <anonymous> (/home/username/workspace/project_name/src/bot.js:6:8)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1548:10)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Module._load (node:internal/modules/cjs/loader:1104:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12)
    at node:internal/main/run_main_module:28:49

Node.js v20.17.0

All the files and folders:
file and folder organization

bot.js code:

require("dotenv").config();

const { Client, Collection, GatewayIntentBits } = require("discord.js");
const client = new Client({
  intents:
    (GatewayIntentBits.Guilds,
    GatewayIntentBits.GuildMessages,
    GatewayIntentBits.MessageContent),
});
const { token } = process.env;
const fs = require("fs");

client.commands = new Collection();
client.commandArary = [];

const functionFolders = fs.readdirSync(`./src/functions`);
for (const folder of functionFolders) {
  const functionFiles = fs
    .readdirSync(`./src/functions/${folder}`)
    .filter((file) => file.endsWith(`.js`));
  for (const file of functionFiles)
    require(`./functions/${folder}/${file}`)(client);
}

client.handleEvents();
client.handleCommands();

client.login(token);

handleCommand.js code:

const fs = require("fs");

module.exports = (client) => {
  client.commandHandler = async () => {
    const commandsFolder = fs.readdirSync(`./src/commands`);
    for (const folder of commandsFolder) {
      const commandFiles = fs
        .readdirSync(`./src/commands/${folder}`)
        .filter((file) => file.endsWith(`.js`));

      const { commands, commandsArray } = client;
      for (const file of commandFiles) {
        const command = require(`../commands/${folder}/${file}`);
        commands.set(command.data.name, command);
        commandsArray.push(command.data.toJSON());
        console.log(
          `Command ${command.data.name} has been regtistered through the command handler succesfully.`
        );
      }
    }
  };
};

Thanks in advance!

Well I tried re-writing the code which at the moment I thought would help, whilst it didn’t and the same error occured