Translator.scala

trait Translator {
  def translate(input: String): String
}

class FakeTranslator extends Translator {
  def translate(input: String): String = input
}

class FrenchTranslatorImpl extends Translator {
  val wordReplacements = Map(
    "hello" -> "bonjour",
    "hi" -> "salut",
    "greetings" -> "salutations"
  )
  def translate(input: String): String = {
    input.split("""\s+""").map(word => wordReplacements.get(word.toLowerCase).map(newWord => word match {
        case _ if word(0).isUpper => newWord.capitalize
        case _ => newWord
      }).getOrElse(word)).mkString(" ")
  }
}