Challenge: Minimum Strength

Kotlin Programming: The Big Nerd Ranch Guide 22. Introduction to Coroutines
6

Hi!
At first I updated syntax of coroutines as shown here:
Coroutines 1.3.5

Then I implemented the mentioned below:

fun fetchCharacterData(): Deferred<CharacterGenerator.CharacterData> {
    var str1 = 0
    var res = ""
    return GlobalScope.async {
        while(str1<10)
        {
            res = URL(CHARACTER_DATA_API).readText()
            str1 = CharacterGenerator.fromApiData(res).str.toInt()
        }
        CharacterGenerator.fromApiData(res)
    }
}

but I believe that it can be realized in Functional programming style…