create a function to remove vowels from a given string

Hi,I am creating a function to remove vowels from a given string but its not working,help me to correct it or give me the correct answer.thank you. CREATE FUNCTION FN_REMOVEL_VOWELS (@STRING VARCHAR(max))returns varcharas begindeclare @v varchar(max)='AEIOUY' ,@startpoint int =1,@letter varchar(max)select @letter=SUBSTRING(@v,@startpoint,1)while @startpoint<LEN(@v)begin select @STRING=REPLACE(@STRING,@letter,'')set @startpoint=@startpoint+1end return @STRINGendSELECT DBO.FN_REMOVEL_VOWELS('INFORMATION SYSTEM')