From Coursera course "Kotlin for Java developers" week 2 - Mastermind game solution

evaluateGuess.kt

package mastermind

data class Evaluation(val rightPosition: Int, val wrongPosition: Int)

fun evaluateGuess(secret: String, guess: String): Evaluation {
    var rightPos = 0
    var wrongPos = 0

    if (secret == guess) {
        return Evaluation(4, 0)
    }

    val secretList = secret.toMutableList()
    val guessList = guess.toMutableList()
    var iterator = guessList.listIterator()

    while (iterator.hasNext()) {
        val i = iterator.nextIndex()
        if (iterator.next() == secretList[i]) {
            rightPos++
            secretList.removeAt(i)
            iterator.remove()
        }
    }
    iterator = guessList.listIterator()

    while (iterator.hasNext()) {
        val nextChar = iterator.next()
        if (nextChar in secretList) {
            wrongPos++
            secretList.removeAt(secretList.indexOf(nextChar))
            iterator.remove()
        }
    }
    return Evaluation(rightPos, wrongPos)
}