Fix lib/util.js
Fix lib/util.js

 - Remove unused modules
 - Fix inconsistencies
 - Simplified condition: `(e && e != '')` is `e` because `''` is falsy

OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner,lteacher/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,lteacher/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner,OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,lteacher/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,lteacher/codewars-runner-cli,Codewars/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,Codewars/codewars-runner-cli,OverZealous/codewars-runner-cli,DonaldKellett/codewars-runner-cli,Codewars/codewars-runner,DonaldKellett/codewars-runner-cli,OverZealous/codewars-runner-cli