public function storeUser($etAge, $etName, $etUsername, $etPassword) {
        $uuid = uniqid('', true);
        $hash = $this->hashSSHA($password);
        $encrypted_password = $hash["encrypted"]; // encrypted password
        $salt = $hash["salt"]; // salt

        $stmt = $this->conn->prepare("INSERT INTO register(etAge, etName, etUsername, etPassword, salt) VALUES(?, ?, ?, ?, ?)");
        $stmt->bind_param("issss", $etAge, $etName, $etUsername, $etPassword, $salt);
        $result = $stmt->execute();
        $stmt->close();

        // check for successful store
        if ($result) {
            $stmt = $this->conn->prepare("SELECT etAge, etName, etUsername, etPassword, salt FROM register WHERE etUsername = ?");
            $stmt->bind_param("s", $etUsername);
            $stmt->execute();
            $stmt->bind_result($etAge, $etName, $etUsername, $etPassword, $salt);
            $user = $stmt->fetch();
            // $user = $stmt->get_result()->fetch_assoc();
            $stmt->close();

            return $user;
        } else {
            return false;
        }
    }