toCharArray
fun StringBuilder.toCharArray( destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length)
Copies characters from this string builder into the destination character array.
Parameters
 destination - the array to copy to.
 destinationOffset - the position in the array to copy to, 0 by default.
 startIndex - the beginning (inclusive) of the range to copy, 0 by default.
 endIndex - the end (exclusive) of the range to copy, length of this string builder by default.
Exceptions
 IndexOutOfBoundsException - or IllegalArgumentException when startIndex or endIndex is out of range of this string builder indices or when startIndex > endIndex.
 IndexOutOfBoundsException - when the subrange doesn't fit into the destination array starting at the specified destinationOffset, or when that index is out of the destination array indices range.
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Licensed under the Apache License, Version 2.0.
    https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/java.lang.-string-builder/to-char-array.html