'Kotlin android highscore combing all instances of score into highscore

I am trying to achive the following:

If you can't see the picture I am basically trying to get the instances of each point gained into another list that combines the total points and lists them according to user

This is as far as I got

private lateinit var recyclerviewFrag : RecyclerView
private lateinit var kotlinPointsData: ArrayList<KotlinPointsData>

              kotlinPointsData.sortBy {
              pointsData -> pointsData.totalpoints
                //if(pointsData.username.duple)
            }
val highscoreList = kotlinPointsData.groupBy { it.username}.forEach{points as
}




recyclerviewFrag.adapter = PointsKotlinAdapter(kotlinPointsData)

android kotlin

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'Kotlin android highscore combing all instances of score into highscore

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