const addUser = ({ id, username, room }) => {
    // Clean the data
    username = username.trim().toLowerCase();
    room = room.trim().toLowerCase();

    // Validate the data
    if (!username || !room) {
        return {
            error: "Username and room required!"
        };
    }

    // Check for existing user
    const existingUser = users.find(user => {
        return user.room === room && user.username === username;
    });

    // Validate username
    if (existingUser) {
        return {
            error: "Username is taken!"
        };
    }

    // Store user
    const user = { id, username, room };
    users.push(user);
    console.log(users);
    return { user };
};