Kotlin version of move last downloaded file (from ~/Downloads) into the current directory

mvldown.kt

import java.nio.file.Paths
import java.io.File

fun main(args: Array<String>) {
    var sortedFiles = Paths.get(System.getProperty("user.home"), "Downloads").
        toFile().
        listFiles()?.
        sortedBy { it.lastModified() }?.
        reversed()

    if (sortedFiles == null || sortedFiles.size == 0) {
      println("Nothing in ~/Downloads")
      return
    }

    var mostRecent = sortedFiles[0]
    var newName = Paths.get(".", mostRecent.getName()).toFile()

    if (newName.exists()) {
      println("$newName already exists...doing nothing")
    } else {
      mostRecent.renameTo(newName)
      println("moving $mostRecent to $newName")
    }
}