feat: implements getConcatenation and findWordsContaining methods in Lesson11

Author: nia-source

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

@@ -9,14 +9,33 @@ public class Lesson11 {
    * https://leetcode.com/problems/concatenation-of-array
    */
   public int[] getConcatenation(int[] nums) {
-    return null;
+    int n = nums.length;
+    int[] ans = new int[2 * n];
+
+    for (int i = 0; i < n; i++) {
+      ans[i] = nums[i];
+      ans[i + n] = nums[i];
+    }
+
+    return ans;
   }
 
   /**
    * 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;
-  }
+    List<Integer> result = new ArrayList<>(); 
+
+        for (int i = 0; i < words.length; i++) { 
+            if (words[i].indexOf(x) != -1) { 
+                result.add(i); 
+            }
+        }
+
+        return result; 
+    }
 }
+
+        
+    

lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/niap_Lesson11_Arrays.java

@@ -0,0 +1 @@
+