Уборка

data = [["Yes", "it's", "mopping", "time"],
        ["my", "friend", "and", "as", "you", "know"],
        ["I", "always", "like", "to", "start"],
        ["in", "the", "exact", "spot", "you're", "standing."]]
cond = {'max_len': 5, 'big_small': True}
for item in cleaning(*data, **cond):
    print(' '.join(item))

def cleaning(*lists, **kwargs):
    result = []
    for lst in lists:
        new_lst = []
        for string in lst:
            if 'x_files' in kwargs:
                string = string.replace('X', str(kwargs['x_files']))
                string = string.replace('x', str(kwargs['x_files']))
            if 'max_len' in kwargs:
                if len(string) > kwargs['max_len']:
                    string = string[:kwargs['max_len']]
            if 'big_small' in kwargs:
                if kwargs['big_small']:
                    string = string.capitalize()
                else:
                    string = string.lower()
            new_lst.append(string)
        result.append(new_lst)
    return result