chore(curriculum): Remove files in wrong format

curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-dot-product.english.md

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+---
+title: Vector dot product
+id: 594810f028c0303b75339ad3
+challengeType: 5
+---
+
+## Description
+<section id='description'>
+<p>
+A vector is defined as having three dimensions as being represented by an ordered collection of three numbers: &nbsp; (X, Y, Z).
+</p>
+<p>
+Task:
+
+    Write a function that takes any numbers of vectors (arrays) as input and computes their dot product.
+
+Your function should return <code>null</code> on
+invalid inputs (ie vectors of different lengths).
+</p>
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: dotProduct must be a function
+    testString: 'assert.equal(typeof dotProduct, ''function'', ''dotProduct must be a function'');'
+  - text: dotProduct() must return null
+    testString: 'assert.equal(dotProduct(), null, ''dotProduct() must return null'');'
+  - text: 'dotProduct([[1], [1]]) must return 1.'
+    testString: 'assert.equal(dotProduct([1], [1]), 1, ''dotProduct([[1], [1]]) must return 1.'');'
+  - text: 'dotProduct([[1], [1, 2]]) must return null.'
+    testString: 'assert.equal(dotProduct([1], [1, 2]), null, ''dotProduct([[1], [1, 2]]) must return null.'');'
+  - text: 'dotProduct([1, 3, -5], [4, -2, -1]) must return 3.'
+    testString: 'assert.equal(dotProduct([1, 3, -5], [4, -2, -1]), 3, ''dotProduct([1, 3, -5], [4, -2, -1]) must return 3.'');'
+  - text: <code>dotProduct(...nVectors)</code> should return 156000
+    testString: 'assert.equal(dotProduct([ 0, 1, 2, 3, 4 ], [ 0, 2, 4, 6, 8 ], [ 0, 3, 6, 9, 12 ], [ 0, 4, 8, 12, 16 ], [ 0, 5, 10, 15, 20 ]), 156000, ''<code>dotProduct(...nVectors)</code> should return 156000'');'
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function dotProduct() {
+    // Good luck!
+}
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function dotProduct(...vectors) {
+  if (!vectors || !vectors.length) {
+    return null;
+  }
+  if (!vectors[0] || !vectors[0].length) {
+    return null;
+  }
+  const vectorLen = vectors[0].length;
+  const numVectors = vectors.length;
+
+  // If all vectors not same length, return null
+  for (let i = 0; i < numVectors; i++) {
+    if (vectors[i].length !== vectorLen) {
+      return null;  // return undefined
+    }
+  }
+
+  let prod = 0;
+  let sum = 0;
+  let j = vectorLen;
+  let i = numVectors;
+  // Sum terms
+  while (j--) {
+    i = numVectors;
+    prod = 1;
+
+    while (i--) {
+      prod *= vectors[i][j];
+    }
+    sum += prod;
+  }
+  return sum;
+}
+
+```
+
+</section>