refactor: use var for result declaration

Author: Ezra Nyabuti

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

@@ -23,7 +23,7 @@ public int[] getConcatenation(int[] nums) {
    * https://leetcode.com/problems/find-words-containing-character/
    */
   public List<Integer> findWordsContaining(String[] words, char x) {
-    List<Integer> result = new ArrayList<>();
+    var result = new ArrayList<Integer>();
     for (int i = 0; i < words.length; i++) {
       if (words[i].indexOf(x) != -1) {
         result.add(i);