Difficulty: Easy

Problem statement:

Write an algorithm to determine if a number is “happy”. 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, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.

I first attempted to solve this one in Go, but got frustrated rather quickly.

I know, I know, I can already hear you. “Are you freaking kidding me dude? You lasted one day with Go!” Yeah, well I’m
still open to using Go for a lot of things, but right now I just wanted to get this thing solved and I knew exactly how to do it
with Java. I couldn’t for the life of me figure out how to *split an integer into digits* using Go. I wasted probably 15-20 minutes
trying to figure this out until just going back to good old Java. Once I did, the solution manifested itself pretty quickly.