fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-48-self-powers.md

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+---
+id: 5900f39c1000cf542c50feaf
+challengeType: 5
+title: 'Problem 48: Self powers'
+forumTopicId: 302157
+---
+
+## Description
+<section id='description'>
+
+The series, 1<sup>1</sup> + 2<sup>2</sup> + 3<sup>3</sup> + ... + 10<sup>10</sup> = 10405071317.
+
+Find the last ten digits of the series, 1<sup>1</sup> + 2<sup>2</sup> + 3<sup>3</sup> + ... + 1000<sup>1000</sup>.
+
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>selfPowers(10, 3)</code> should return a number.
+    testString: assert(typeof selfPowers(10, 3) === 'number');
+  - text: <code>selfPowers(10, 3)</code> should return 317.
+    testString: assert.strictEqual(selfPowers(10, 3), 317);
+  - text: <code>selfPowers(150, 6)</code> should return 29045.
+    testString: assert.strictEqual(selfPowers(150, 6), 29045);
+  - text: <code>selfPowers(673, 7)</code> should return 2473989.
+    testString: assert.strictEqual(selfPowers(673, 7), 2473989);
+  - text: <code>selfPowers(1000, 10)</code> should return 9110846700.
+    testString: assert.strictEqual(selfPowers(1000, 10), 9110846700);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function selfPowers(power, lastDigits) {
+
+  return true;
+}
+
+selfPowers(1000, 10);
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function selfPowers(power, lastDigits) {
+  let sum = 0;
+  const modulo = Math.pow(10, lastDigits);
+
+  for (let i = 1; i <= power; i++) {
+    let temp = i;
+    for (let j = 1; j < i; j++) {
+      temp *= i;
+      temp %= modulo;
+    }
+
+    sum += temp;
+    sum %= modulo;
+  }
+
+  return sum;
+}
+```
+
+</section>