human
Solve the following python programming problem given the following code:
def authorize_same_account(account_to_match) : 
    def auth_callback_same_account(req) : 
        try : 
            (_ver, acc, _rest) = req.split_path (2, 3, True) 
except ValueError : 
            return HTTPUnauthorized (request = req) 
if (acc == account_to_match) : 
            return None 
else : 
            return HTTPUnauthorized (request = req) 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: account_to_match
assistant
#Here is a proper replacement for <MASK>.
def auth_callback_same_account(