如何使用scala删除文件中的重复单词？

import scala.io.Source
import java.io.PrintWriter

def removeDuplicateWordsFromFile(inputFile: String, outputFile: String): Unit = {
  val words = Source.fromFile(inputFile).getLines.flatMap(_.split("\\W+")).toSet
  val writer = new PrintWriter(outputFile)
  words.foreach(writer.println)
  writer.close()
}

val inputFile = "path/to/input/file.txt"
val outputFile = "path/to/output/file.txt"
removeDuplicateWordsFromFile(inputFile, outputFile)