How to write function in sql which accept table as input and return result back as table?

CREATE FUNCTION fn_CalculateListing(@Listing ListingColumn READONLY)
RETURNS TABLE 
AS
BEGIN
    DECLARE @result TABLE (ID INT, Name VARCHAR(50))

    INSERT INTO @result(ID,Name)
        SELECT ROWID, Name
        FROM @Listing

    RETURN @Listing
END

Msg 137, Level 15, State 2, Procedure fn_CalculateListing, Line 16
Must declare the scalar variable "@Listring".

Msg 102, Level 15, State 31, Procedure fn_CalculateListing, Line 29
Incorrect syntax near 'BEGIN'.`