Solve: Mix String

Imported By: Geoffrey Challen

/ Version: 2021.7.0

/ Adapted from CodingBat

Given two non-null Strings, create a bigger string made of the first character of the first String, the first character of the second String, the second character of the first String, the second character of the second String, and so on. Any leftover chars should go at the end of the result.