fixed arrow function with no curly braces failing IIFE test (#38544)

* fixed arrow function with no curly braces failing IIFE test

* added iife 2nd test fix and 3 new solutions

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-immediately-invoked-function-expression-iife.english.md

@@ -30,9 +30,9 @@ Rewrite the function <code>makeNest</code> and remove its call so instead it's a
 ```yml
 tests:
   - text: The function should be anonymous.
-    testString: assert(/\((function|\(\))(=>|\(\)){/.test(code.replace(/\s/g, "")));
+    testString: assert(/\((function|\(\))(=>|\(\)){?/.test(code.replace(/\s/g, "")));
   - text: Your function should have parentheses at the end of the expression to call it immediately.
-    testString: assert(/}\)\(\)/.test(code.replace(/\s/g, "")));
+    testString: assert(/}?\)\(\)$|}\(\)\)$/.test(code.replace(/[\s;]/g, "")));
 
 ```
 
@@ -67,4 +67,22 @@ makeNest();
 })();
 ```
 
+```js
+(function () {
+  console.log("A cozy nest is ready");
+}());
+```
+
+```js
+(() => {
+  console.log("A cozy nest is ready");
+})();
+```
+
+```js
+(() =>
+  console.log("A cozy nest is ready")
+)();
+```
+
 </section>