Drill 17: Find the core line — Classes and data classes

data class User(val id: String, val name: String)

sealed class Result {
    data class Ok(val value: String) : Result()
    data class Error(val message: String) : Result()
}

fun render(result: Result) = when (result) {
    is Result.Ok -> result.value
    is Result.Error -> result.message
}