Feat: add new Markdown parser (#39800)

and change all the challenges to new `md` format.

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/cusip.md

@@ -5,55 +5,79 @@ challengeType: 5
 forumTopicId: 302241
 ---
 
-## Description
+# --description--
 
-<section id='description'>
+A **CUSIP** is a nine-character alphanumeric code that identifies a North American financial security for the purposes of facilitating clearing and settlement of trades. The CUSIP was adopted as an American National Standard under Accredited Standards X9.6.
 
-A <b>CUSIP</b> is a nine-character alphanumeric code that identifies a North American financial security for the purposes of facilitating clearing and settlement of trades. The CUSIP was adopted as an American National Standard under Accredited Standards X9.6.
+# --instructions--
 
-</section>
-
-## Instructions
-
-<section id='instructions'>
 Write a function that takes a string as a parameter and checks if the string is valid CUSIP.
-</section>
 
-## Tests
+# --hints--
 
-<section id='tests'>
+`isCusip` should be a function.
 
-```yml
-tests:
-  - text: <code>isCusip</code> should be a function.
-    testString: assert(typeof isCusip == 'function');
-  - text: <code>isCusip("037833100")</code> should return a boolean.
-    testString: assert(typeof isCusip("037833100") == 'boolean');
-  - text: <code>isCusip("037833100")</code> should return <code>true</code>.
-    testString: assert.equal(isCusip("037833100"), true);
-  - text: <code>isCusip("17275R102")</code> should return <code>true</code>.
-    testString: assert.equal(isCusip("17275R102"), true);
-  - text: <code>isCusip("38259P50a")</code> should return <code>false</code>.
-    testString: assert.equal(isCusip("38259P50a"), false);
-  - text: <code>isCusip("38259P508")</code> should return <code>true</code>.
-    testString: assert.equal(isCusip("38259P508"), true);
-  - text: <code>isCusip("38259P50#")</code> should return <code>false</code>.
-    testString: assert.equal(isCusip("38259P50#"), false);
-  - text: <code>isCusip("68389X105")</code> should return <code>true</code>.
-    testString: assert.equal(isCusip("68389X105"), true);
-  - text: <code>isCusip("68389X106")</code> should return <code>false</code>.
-    testString: assert.equal(isCusip("68389X106"), false);
-  - text: <code>isCusip("5949181")</code> should return <code>false</code>.
-    testString: assert.equal(isCusip("5949181"), false);
+```js
+assert(typeof isCusip == 'function');
 ```
 
-</section>
+`isCusip("037833100")` should return a boolean.
 
-## Challenge Seed
+```js
+assert(typeof isCusip('037833100') == 'boolean');
+```
 
-<section id='challengeSeed'>
+`isCusip("037833100")` should return `true`.
 
-<div id='js-seed'>
+```js
+assert.equal(isCusip('037833100'), true);
+```
+
+`isCusip("17275R102")` should return `true`.
+
+```js
+assert.equal(isCusip('17275R102'), true);
+```
+
+`isCusip("38259P50a")` should return `false`.
+
+```js
+assert.equal(isCusip('38259P50a'), false);
+```
+
+`isCusip("38259P508")` should return `true`.
+
+```js
+assert.equal(isCusip('38259P508'), true);
+```
+
+`isCusip("38259P50#")` should return `false`.
+
+```js
+assert.equal(isCusip('38259P50#'), false);
+```
+
+`isCusip("68389X105")` should return `true`.
+
+```js
+assert.equal(isCusip('68389X105'), true);
+```
+
+`isCusip("68389X106")` should return `false`.
+
+```js
+assert.equal(isCusip('68389X106'), false);
+```
+
+`isCusip("5949181")` should return `false`.
+
+```js
+assert.equal(isCusip('5949181'), false);
+```
+
+# --seed--
+
+## --seed-contents--
 
 ```js
 function isCusip(s) {
@@ -61,12 +85,7 @@ function isCusip(s) {
 }
 ```
 
-</div>
-</section>
-
-## Solution
-
-<section id='solution'>
+# --solutions--
 
 ```js
 function isCusip(s) {
@@ -96,5 +115,3 @@ function isCusip(s) {
   return s.charCodeAt(8) - 48 == (10 - (sum % 10)) % 10;
 }
 ```
-
-</section>