fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/rosetta-code/greatest-common-divisor.md

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+---
+title: Greatest common divisor
+id: 5a23c84252665b21eecc7e82
+challengeType: 5
+videoUrl: ''
+localeTitle: 最大公约数
+---
+
+## Description
+<section id="description">编写一个函数，返回两个整数的最大公约数。 </section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>gcd</code>应该是一个功能。
+    testString: assert(typeof gcd=='function');
+  - text: '<code>gcd(24,36)</code>应该返回一个数字。'
+    testString: assert(typeof gcd(24,36)=='number');
+  - text: '<code>gcd(24,36)</code>应该返回<code>12</code> 。'
+    testString: assert.equal(gcd(24,36),12);
+  - text: '<code>gcd(30,48)</code>应该返回<code>6</code> 。'
+    testString: assert.equal(gcd(30,48),6);
+  - text: '<code>gcd(10,15)</code>应该返回<code>5</code> 。'
+    testString: assert.equal(gcd(10,15),5);
+  - text: '<code>gcd(100,25)</code>应该返回<code>25</code> 。'
+    testString: assert.equal(gcd(100,25),25);
+  - text: '<code>gcd(13,250)</code>应该返回<code>1</code> 。'
+    testString: assert.equal(gcd(13,250),1);
+  - text: '<code>gcd(1300,250)</code>应该返回<code>50</code> 。'
+    testString: assert.equal(gcd(1300,250),50);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function gcd(a, b) {
+  // Good luck!
+}
+
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>