public async Task <IActionResult> GetById(Guid?id)
        {
            if (id == null || id.Value == Guid.Empty)
            {
                return(BadRequest("Id must not be empty"));
            }

            var employee = await _employeeDAO.GetEmployeeById(id);

            if (employee == null)
            {
                return(NotFound($"Employee with Id {id} doesn't exit"));
            }

            return(Ok(employee));
        }