How to execute function in SQL Server

I build a function and I am trying to execute it…but some errors are occurring

CREATE FUNCTION dbo.Afisho_rankimin
(
    @emri_rest int
)
RETURNS int
AS
BEGIN
    Declare @rankimi int

    Select @rankimi = dbo.RESTORANTET.Rankimi
    From RESTORANTET
    Where dbo.RESTORANTET.ID_Rest = @emri_rest

    RETURN @rankimi
END
GO

SELECT dbo.Afisho_rankimin(5) AS Rankimi
GO

>Solution :

The function is not being created. Try calling your function something else.

CREATE FUNCTION dbo.Afisho_rankimin1(@emri_rest int)
RETURNS int
AS
   BEGIN
       Declare @rankimi int
       Select @rankimi=dbo.RESTORANTET.Rankimi
       From RESTORANTET
       Where  dbo.RESTORANTET.ID_Rest=@emri_rest
       RETURN @rankimi
  END
  GO
  
  SELECT dbo.Afisho_rankimin1(5) AS Rankimi