chore(docs): add comments

Author: amejiarosario

CONTRIBUTING.md

@@ -165,7 +165,7 @@ Just as in the **subject**, use the imperative, present tense: "change" not "cha
 The body should include the motivation for the change and contrast this with previous behavior.
 
 ### Footer
-The footer should contain any information about **Breaking Changes** and is also the place to
+The footer should contain any information about **BREAKING CHANGES** and is also the place to
 reference GitHub issues that this commit **Closes**.
 
 ```

lab/exercises/10-mixed/min-permutations.js

@@ -0,0 +1,34 @@
+/*eslint-disable */
+
+function reverse (arr, i, j) {
+  while (i < j) {
+    [arr[i], arr[j]] = [arr[j], arr[i]];
+    i++;
+    j--;
+  }
+}
+
+function backtracking(array, start = 0) {
+  let permutations = [array];
+
+  for (let i = start; i < array.length - 1; i++) {
+    for (let j = i + 1; j < array.length; j++) {
+      reverse(array, i, j);
+      permutations = permutations.concat(backtracking(array, i + 1));
+      reverse(array, i, j);
+    }
+  }
+
+  return permutations;
+}
+
+function minPermutations(arr) {
+  return backtracking(arr);
+}
+
+module.exports = minPermutations;
+
+//*/
+// console.log(backtracking([1,2,3]));
+// console.log(backtracking([1,2,3,4]));
+//*/

lab/exercises/10-mixed/min-permutations.spec.js

@@ -0,0 +1,7 @@
+const fn = require('./min-permutations');
+
+describe('Min Permutations', () => {
+  it('should work', () => {
+    expect(fn([1,2,3])).toEqual();
+  });
+});