fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-222-sphere-packing.md

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+---
+id: 5900f44b1000cf542c50ff5d
+challengeType: 5
+title: 'Problem 222: Sphere Packing'
+videoUrl: ''
+localeTitle: 问题222：球体包装
+---
+
+## Description
+<section id="description">什么是最短管道的长度，内径为50毫米，可以完全包含21个半径为30毫米，31毫米，......，50毫米的球？ <p>以微米（10-6米）四舍五入到最接近的整数给出答案。 </p></section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>euler222()</code>应该返回1590933。
+    testString: assert.strictEqual(euler222(), 1590933);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler222() {
+  // Good luck!
+  return true;
+}
+
+euler222();
+
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>