PasswordProcessor.kt

package oop.ResponsabilityChain

class PasswordProcessor(val next : MessageProcessor? = null) : MessageProcessor {

  override fun process(message: Message) : String {
   if (message is Message.Password) {
     return message.message.map { '*' }.joinToString(separator = "")
   } else {
     return next?.process(message) ?: message.message
   }
  }

}