https://ruijarimba.wordpress.com/2014/08/11/code-kata-numbers-to-words-using-javascript-and-tdd/
https://www.osgeo.cn/app/s2722?numver=102&textver=+One++Hundred++One+
https://github.com/ravidsrk/NumberToWords-Kata/blob/master/src/com/ravidsrk/algorithms/NumbersToWords.java https://github.com/AdvancedProgrammingWithJavaSummer2017/NumbersToWordsKata/blob/master/number2words/src/main/java/edu/pdx/cs410J/numbers2words/NumbersToWords.java