inline fun <R> CharSequence.minOfWithOrNull( comparator: Comparator<in R>, selector: (Char) -> R ): R?
Returns the smallest value according to the provided comparator among all values produced by selector function applied to each character in the char sequence or null if there are no characters.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/min-of-with-or-null.html