Виконані завдання з java-fundamentals-exercises by Kostenko Anastasiia #197
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1)Implemented the getWelcomeMessage() method in the ExerciseIntroduction class to return the string "The key to efficient learning is practice!".
2)Implemented the encodeMessage(String message) method in the ExerciseIntroduction class to encode the input string in Base64 format and return the result.