0-0-into - fixed methods

0-0-intro/src/main/java/com/bobocode/intro/ExerciseIntroduction.java

@@ -1,6 +1,6 @@
 package com.bobocode.intro;
 
-import com.bobocode.util.ExerciseNotCompletedException;
+import java.util.Base64;
 
 /**
  * Welcome! This is an introduction exercise that will show you a simple example of Bobocode exercises.
@@ -16,15 +16,15 @@
  * @author Taras Boychuk
  */
 public class ExerciseIntroduction {
+
     /**
      * This method returns a very important message. If understood well, it can save you years of inefficient learning,
      * and unlock your potential!
      *
      * @return "The key to efficient learning is practice!"
      */
     public String getWelcomeMessage() {
-        // todo: implement a method and return a message according to javadoc
-        throw new ExerciseNotCompletedException(); 
+        return "The key to efficient learning is practice!";
     }
 
     /**
@@ -39,7 +39,6 @@ public String getWelcomeMessage() {
      * @return encoded message
      */
     public String encodeMessage(String message) {
-        // todo: switch to branch "completed" in order to see how it should be implemented
-        throw new ExerciseNotCompletedException();
+        return Base64.getEncoder().encodeToString(message.getBytes());
     }
 }