Rop5.cs

Union<Customer,Failure> ValidateEmail(Customer c) { 
    if(c.Email is null)
        return new Failure("Email is not valid");
	
    return c;
}

Union<Customer,Failure> ValidateNameSurname(Customer c) { 
    if(c.Name is null)
        return new Failure("Name is not valid");
    if(c.Surname is null)
        return new Failure("Surname is not valid");	
    return c;
}