human
Solve the following python programming problem given the following code:
@ pytest.fixture (scope = 'function') 
def remove_additional_dirs(request) : 
    '
    Remove special directories which are created during the tests.
    ' 
    def fin_remove_additional_dirs() : 
        if os.path.isdir ('fake-project') : 
            utils.rmtree ('fake-project') 
if os.path.isdir ('fake-project-extra') : 
            utils.rmtree ('fake-project-extra') 
if os.path.isdir ('fake-project-templated') : 
            utils.rmtree ('fake-project-templated') 
request.addfinalizer (<MASK>) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: request
assistant
#Here is a proper replacement for <MASK>.
def fin_remove_additional_dirs(