def flatten(dictionary, children=None):
    if children is None:
        children = []
    new_dict = {}
    for name, value in dictionary.items():
        if isinstance(value, dict):
            if len(value) != 0:
                children.append(name)
                new_dict.update(flatten(value, children))
                children.pop()
            elif len(children) == 0:
                new_dict[name] = ""
            else:
                new_dict["/".join(children) + "/" + name] = ""
        elif len(children) == 0:
            new_dict[name] = value
        else:
            new_dict["/".join(children) + "/" + name] = value
    return new_dict


if __name__ == '__main__':
    test_input = {"key": {"deeper": {"more": {"enough": "value"}}}}
    print(' Input: {}'.format(test_input))
    print('Output: {}'.format(flatten(test_input)))

    # These "asserts" using only for self-checking and not necessary for auto-testing
    assert flatten({"key": "value"}) == {"key": "value"}, "Simple"
    assert flatten(
        {"key": {"deeper": {"more": {"enough": "value"}}}}
    ) == {"key/deeper/more/enough": "value"}, "Nested"
    assert flatten({"empty": {}}) == {"empty": ""}, "Empty value"
    assert flatten({"name": {
        "first": "One",
        "last": "Drone"},
        "job": "scout",
        "recent": {},
        "additional": {
            "place": {
                "zone": "1",
                "cell": "2"}}}
    ) == {"name/first": "One",
          "name/last": "Drone",
          "job": "scout",
          "recent": "",
          "additional/place/zone": "1",
          "additional/place/cell": "2"}
    var = {"job/1": "scout", "recent/places/earth/NY": "2017", "job/3": "writer", "job/2": "worker", "job/5": "learner",
           "job/4": "reader", "recent/places/earth/NP": "", "recent/places/earth/Louvre": "2015",
           "recent/times/XX/1964": "Yes", "recent/times/XXI/2064": "Nope", "name/first": "Second", "name/last": "Drone",
           "name/nick": ""}
    assert flatten({"name": {"first": "Second", "last": "Drone", "nick": {}},
                    "job": {"1": "scout", "2": "worker", "3": "writer", "4": "reader", "5": "learner"},
                    "recent": {"places": {"earth": {"Louvre": "2015", "NY": "2017", "NP": ""}},
                               "times": {"XX": {"1964": "Yes"}, "XXI": {"2064": "Nope"}}}}) == var
    print('You all set. Click "Check" now!')