fun CharSequence.randomOrNull(): Char?
Returns a random character from this char sequence, or null if this char sequence is empty.
fun CharSequence.randomOrNull(random: Random): Char?
Returns a random character from this char sequence using the specified source of randomness, or null if this char sequence is empty.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/random-or-null.html