Question : SQL Function Question

Two part question:

1) I am trying to write a function that returns a string based upon field values (see code snipit). I think I have that part correct.... What is the statement to 'Returns' - I just need it to be a string value based upon the selected Case. I have a husband 1st name and last name and wife 1st and last name. My Goal is one of the following (depending upon if any null values or different last names):

a) Joe Smith
b) Joe & Lisa Smith
c) Joe Smith & Lisa Jones

2) How do I use this function in a different Query? For example.

Create Procedure ClientSearch @ID int
As
Select * from Client, GetName(@ID)
From Client

Thanks.

Code Snippet:

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Create Function GetName @ID int 
Returns ??????
 
AS
 
Select 
Case cSpouseName
 When Null Then cFirstName + '  ' + cLastName 
 Else 
    Case cSpouseLastName 
      When Null Then cFirstName + ' & ' + cSpouseName + ' ' + cLastName
      Else cFirstName + ' ' + cLastName 
      End
End  
 
FROM Client 
Where cClient = @ID

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Answer : SQL Function Question

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Create Function GetName @ID int 
Returns VARCHAR(100)
 
AS
 
Select 
Case cSpouseName
 When Null Then cFirstName + '  ' + cLastName 
 Else 
    Case cSpouseLastName 
      When Null Then cFirstName + ' & ' + cSpouseName + ' ' + cLastName
      Else cFirstName + ' ' + cLastName 
      End
End  
 
FROM Client 
Where cClient = @ID

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