changed Engine.java and Makefile, Progression.java

Author: xcenia9

app/Makefile

@@ -1,2 +1,4 @@
 run-dist:
-	./build/install/app/bin/app
+	./build/install/app/bin/app
+lint:
+	./gradlew checkstyleMain

app/src/main/java/hexlet/code/Engine.java

@@ -28,7 +28,8 @@ public static void gameEngine(String exercise, String[][] questionAndAnswer) {
                 System.out.println("'" + answer + "' is wrong answer ;(. Correct answer was '" + correctAnswer + "'");
                 System.out.println("Let's try again, " + name + "!");
                 break;
-            } System.out.println("Correct!");
+            }
+            System.out.println("Correct!");
             count++;
         }
         if (count == COUNT_OF_ROUNDS) {

app/src/main/java/hexlet/code/games/Progression.java

@@ -17,18 +17,12 @@ private static String[] getQuestionAndAnswer() {
         }
         int randomIndex = Utils.getRandomNumber(0, randomLength - 1);
         String correctAnswer = String.valueOf(numbers[randomIndex]);
+        numbers[randomIndex] = -1;
+        String question = String.join(" ", java.util.Arrays.stream(numbers)
+                .mapToObj(num -> num == -1 ? ".." : String.valueOf(num))
+                .toArray(String[]::new));
 
-        StringBuilder questionBuilder = new StringBuilder();
-        for (int i = 0; i < randomLength; i++) {
-            if (i == randomIndex) {
-                questionBuilder.append(".. ");
-            } else {
-                questionBuilder.append(numbers[i]).append(" ");
-            }
-        }
-
-        String question = questionBuilder.toString().trim();
-        return new String[] {question, correctAnswer};
+        return new String[] {question.trim(), correctAnswer};
     }
 
     public static void gameProgression() {