How to use the jrnl.util.slugify function in jrnl

    make_filename = lambda entry: e.date.strftime("%Y-%m-%d_{0}.{1}".format(slugify(u(e.title)), format))
    for e in journal.entries:

def make_filename(cls, entry):
        return entry.date.strftime(
            "%Y-%m-%d_{}.{}".format(slugify(str(entry.title)), cls.extension)
        )

def make_filename(self, entry):
        return entry.date.strftime(
            "%Y-%m-%d_{}.{}".format(slugify(entry.title), self.extension)
        )