There is something wrong with the following code! Debug the code to satisfy the docstring.defbad_list_flattener

 (lst1, lst2):
    """
    Flattens both lst1 and lst2, and returns the 
    concatenation of the two flattened lists. Flattening 
    a list means to collapse the list into one 
    dimension (like np.flatten).
    >>> girls = [['Rachel', 'Green'], ['Phoebe', 'Buffay']]
    >>> boys = [['Ross', 'Geller'], ['Chandler', 'Bing']]
    >>> bad_list_flattener(girls, boys)
    ['Rachel', 'Green', 'Phoebe', 'Buffay', 'Ross', 'Geller', 'Chandler', 'Bing']
    >>> cats = [['Persian'], ['British', 'Shorthair']]
    >>> dogs = [['Golden', 'Retriever']]
    >>> bad_list_flattener(dogs, cats)
    ['Golden', 'Retriever', 'Persian', 'British', 'Shorthair']
    """
    newlist1 = []
    newlist2 = []
    for inner_lst in lst1:
        for item in inner_lst:
            newlist1 += item
    for inner_lst in lst2:
        for item in inner_lst:
            newlist2 += item
    return newlist1 + newlist2

please debug this code

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