add filter users

        except Exception as e:

            return "Error when retreiving event: ", e

    def get_user(self):

    def get_users(self):

        try:

            json_users = self.retrieve_users()

            return jsonify(json_users), 200

        except Exception as e:

            return "Error when retrieving users list: ", e

    def get_user(self, name):

        try:

            json_users = self.retrieve_users()

            filtered_users = [user for user in json_users if user["username"] == name]

            return jsonify(filtered_users), 200

        except Exception as e:

            return "Error when retrieving user: ", e

    def get_num_user(self):

        try:

            json_users = self.retrieve_users()