fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-178-step-numbers.md

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+---
+id: 5900f41e1000cf542c50ff31
+challengeType: 5
+title: 'Problem 178: Step Numbers'
+videoUrl: ''
+localeTitle: 问题178：步骤编号
+---
+
+## Description
+<section id="description">考虑数字45656.可以看出，45656的每对连续数字的差值为1。每对连续数字的差值为1的数字称为步数。 pandigital数字包含从0到9的每个十进制数字至少一次。 <p>有多少pandigital步数小于1040？ </p></section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>euler178()</code>应该返回126461847755。
+    testString: assert.strictEqual(euler178(), 126461847755);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler178() {
+  // Good luck!
+  return true;
+}
+
+euler178();
+
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>