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Take a nested list and return a single flattened list with all values except nil/null.
The challenge is to take an arbitrarily-deep nested list-like structure and produce a flattened structure without any nil/null values.
For example:
input: [1,[2,3,null,4],[null],5]
output: [1,2,3,4,5]
The instructions above are synchronized with a shared repository to ensure consistency across all language tracks. This appendix provides additional clarification or modifies the instructions as needed to better align with the goals of the Clojure track.
For this exercise in the Clojure track, you may assume the input is any nested combination of vectors, and the output is a vector, as indicated by the tests. However, this is not a strict requirement; you are free to assume that the input is any nested combination of sequential things (lists, vectors, etc.), and the output is a sequence.
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