private Result SetEmployerId(Employer id)
    {
        var result = EmployerIdValidator.Validate(id);

        if (result.Success)
        {
            this.employerId = id;
        }
        return(result);
    }
    public Result ChangeEmployer(EmployerId id)
    {
        var result = EmployerIdValidator.Validate(id);

        if (result.Success)
        {
            this.employerId = id;
        }
        return(result);
    }