feat: add Dasias leet code answers to lesson11 in java

Author: Dasiame

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

@@ -1,22 +1,35 @@
 package com.codedifferently.lesson11;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class Lesson11 {
-
   /**
    * Provide the solution to LeetCode 1929 here:
    * https://leetcode.com/problems/concatenation-of-array
    */
   public int[] getConcatenation(int[] nums) {
-    return null;
+    int[] answer = new int[2 * nums.length];
+    for (int i = 0; i < nums.length; i++) {
+      answer[i] = nums[i];
+      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;
+    List<Integer> answer = new ArrayList<>();
+    for (int i = 0; i < words.length; i++) {
+      if (words[i].contains(Character.toString(x))) {
+        answer.add(i);
+      }
+    }
+    return answer;
   }
 }
+// I got help from Joesphs to talk things out and explain what this code is doing and how to go
+// about applying code and what does it mean