Reversing a string in Kotlin 1.5

gistfile1.txt

import java.text.BreakIterator
import java.text.StringCharacterIterator

fun reverse(string: String): String {
    val iterator = BreakIterator.getCharacterInstance()
    iterator.text = StringCharacterIterator(string)
    val characters = mutableListOf<String>()
    while (true) {
        val startOffset = iterator.current()
        if (iterator.next() == BreakIterator.DONE) {
            break;
        }
        val endOffset = iterator.current()
        val character = string.substring(startOffset, endOffset)
        characters.add(character)
    }
    characters.reverse()
    return characters.joinToString(separator = "")
}