hello, guys) pretty noob question, but stuck) How ...

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[kitttn]

hello, guys)
pretty noob question, but stuck)
How to generate string with K symbols?
In java, i write something like this, but how to do the same in Kotlin?

fun generateString(len: Int) : String {
        var res = ""
        for (i in 0..len)
            res += (97 +Math.floor(Math.random() * 26)) as Char
        
        return res
    }

compiler tells me "that cast can never succeed"