Feat:Fixed solutions (removed boilerPlate that caused 'return null' for both solutions)

Author: nilejack

lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/Lesson11.java

@@ -9,36 +9,20 @@ public class Lesson11 {
    * Provide the solution to LeetCode 1929 here:
    * https://leetcode.com/problems/concatenation-of-array
    */
-  public int[] getConcatenation(int[] nums) {
-    return null;
-  }
-
-  class Solution {
     public int[] getConcatenation(int[] nums) {
       int answer[] = new int[2 * nums.length];
       for (int i = 0; i < nums.length; i++) {
         answer[i] = nums[i];
-      }
-      int index = nums.length;
-      for (int i = 0; i < nums.length; i++) {
-        answer[index] = nums[i];
-        index++;
+        answer[i + nums.length] = nums[i];
       }
       return answer;
     }
-  }
+  
 
   /**
    * Provide the solution to LeetCode 2942 here:
    * https://leetcode.com/problems/find-words-containing-character/
    */
-  public List<Integer> findWordsContaining(String[] words, char x) {
-
-    return null;
-  }
-}
-
-class Solution {
   public List<Integer> findWordsContaining(String[] words, char x) {
     List<Integer> resultWords = new ArrayList<>();
     for (int i = 0; i < words.length; i++) {