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The current string shrink algorithm generates candidates by dropping single characters from the end of the input. This doesn't produce the smallest case, since it doesn't drop characters from the start of the string. It is also linear on the size of the input, so it requires a potentially large number of tries to reach the result it does produce.
This PR changes to algorithm to bisect the input string from both directions, producing a minimal output in log n tries.
As an example of the current behavior, the test:
forAll { it: String -> !it.contains("#") }
produces output like this:
This is 21 attempts to produce a string 32x longer than optimal.
The new algorithm produces output like this:
This is only 7 tries, and produces the correct output of
"#"