public async Task <IActionResult> UpdateUsername(ChangeUsernameInput input)
        {
            await changeUsername.ExecuteAsync(input);

            return(Ok());
        }
        public async Task <IActionResult> UpdateUsername(ChangeUsernameInput input)
        {
            await dispatcher.DispatchAsync(new ChangeUsernameCommand(input.Email, input.NewUsername));

            return(Ok());
        }