Bonus Exercise 4 completed.

src/main/java/BonusExercises.java

@@ -76,11 +76,27 @@ public class BonusExercises {
      */
     public List<String> findPalindromes(String string) {
         List<String> list = new ArrayList<>();
-        // todo
+
+        String regex = "[^a-zA-Z]+";
+
+        //Splitting the string by anything except words to check each one
+        String[] words = string.split(regex);
+
+        for (String word : words) {
+            if (word.length() >= 3) {
+                //Case-insensitive
+                String lower = word.toLowerCase();
+                String reversed = new StringBuilder(lower).reverse().toString();
+
+                //Checking if it's palindrome or not
+                if (lower.equals(reversed)) {
+                    list.add(word);
+                }
+            }
+        }
+
         return list;
     }
 
-    public static void main(String[] args) {
+    public static void main(String[] args) {}
-        // you can test your code here
-    }
 }