[Kotlin/프로그래머스] 코딩테스트 연습 > 연습문제 > 둘만의 암호

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class Solution {
fun solution(s: String, skip: String, index: Int): String {
var answer: String = ""
val set = skip.toHashSet()
s.forEach { char ->
var count = 0
var nextChar = char
repeat(index) {
count++
nextChar = (nextChar.code + 1).toChar()
if (nextChar.code > 'z'.code) {
nextChar = (nextChar.code - 'z'.code + 'a'.code - 1).toChar()
}
while (set.contains(nextChar)) {
nextChar = (nextChar.code + 1).toChar()
if (nextChar.code > 'z'.code) {
nextChar = (nextChar.code - 'z'.code + 'a'.code - 1).toChar()
}
}

        }
        answer += nextChar
    }
    return answer
}
}