Flatten lists

Created by Julien Palard

Write a flatten function, which given a list of lists (of any depth) returns a flattened version of it.

Example

>>> flatten([[1], 2, [[3, 4], 5], [[[]]], [[[6]]], 7, 8, []])
[1, 2, 3, 4, 5, 6, 7, 8]

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