Fix isHappyNumber function

[davcs86]

There is currently a method called isHappyNumber that lives in /lib/isHappyNumber.js. It is incomplete and needs to be fixed!

According to wikipedia:

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits in base-ten, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers (or sad numbers).

Acceptance Criteria:

1. Running yarn test isHappyNumber results in tests passing.
2. You have written a skeleton method for someone else to work on.
3. You have written tests surrounding your skeleton method.
4. Running yarn lint does not print any errors to the console!
5. Optional: write one or two more tests surrounding the method you are solving to account for potential edge cases.

Please include the skeleton of a new method + an accompanying test for someone else to work on at the time of creating a pull request! A pull request will most likely be denied if it does not contain a skeleton method for someone else to work on! For more information, please read the Contributing Guide.

Thank you so much for your contribution!

[Soben]

I'm taking a look at this. Need to brush up on my math functions.

[davcs86]

hehe @Soben, Math is fun! :)

[BlakeGuilloud]

You got it @Soben