SQL Script: upcase the first letter of each word

Create Function [DBO]. [initcap] (@ inputstring varchar (4000 ))
Returns varchar (4000)
As
Begin

Declare @ index int
Declare @ char (1)
Declare @ prevchar char (1)
Declare @ outputstring varchar (255)

Set @ outputstring = lower (@ inputstring)
Set @ Index = 1

While @ index <= Len (@ inputstring)
Begin
Set @ char = substring (@ inputstring, @ index, 1)
Set @ prevchar = case when @ Index = 1 then''
Else substring (@ inputstring, @ index-1, 1)
End

If @ prevchar in ('',';',':','! ','? ',',','.','_','-','/','&','''','(')
Begin
If @ prevchar! = ''' Or upper (@ char )! ='S'
Set @ outputstring = stuff (@ outputstring, @ index, 1, upper (@ char ))
End

Set @ Index = @ index + 1
End

Return @ outputstring

End
Go