J-G, thanks for the problem. Could you add some more information about expected inputs and outputs? An example and some more tests would be helpful too. If your test suite has exactly one test, it's trivial to write a correct answer.
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Number of 1s in a binary string
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Area of a disk
length of a vector
Convert nested struct-array to numeric array
Only once: cleaning up your columns
Order of things - 1
Create a random vector of integers with given sum
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