Query string format validation#6
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This PR adds validation of the input query string.
Validates that
questionmatches the format<text>?[A1,A2,...,AN]and thatthe parsed answer count equals
numberOfOutcomes.Strict structural checks:
?must appear at least once.[must be the byte immediately after the first?.]must be the last byte of the string.Accepted limitations (gas trade-off):
?[A,,B]) and leading/trailing delimiters (?[A,],?[,A]) over-count answers. Detecting empty tokens would require a secondpass; the count is left to caller-side validation of
numberOfOutcomes.