Split Function to create table separated by comma

CREATE FUNCTION [dbo].[fnSplitString]
(
    @string NVARCHAR(MAX),
    @delimiter CHAR(1)
)
RETURNS @output TABLE(splitdata NVARCHAR(MAX)
)
BEGIN
    DECLARE @start INT, @end INT
    SELECT @start = 1, @end = CHARINDEX(@delimiter, @string)
    WHILE @start < LEN(@string) + 1 BEGIN
        IF @end = 0 
            SET @end = LEN(@string) + 1
      
        INSERT INTO @output (splitdata) 
        VALUES(SUBSTRING(@string, @start, @end - @start))
        SET @start = @end + 1
        SET @end = CHARINDEX(@delimiter, @string, @start)
       
    END
    RETURN
END