Given a character vector s, return the first character that appears exactly once in s.
If every character repeats at least once, return the empty char '' (1×0 char).
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In addition to the broken test suite, '' is 0×0, not 1×0 (so the problem description is wrong), and it's generally better to test whether an array is empty by using isempty() rather than by explicitly comparing to e.g. ''.