I did some changes: refactoring, bugfixing, logging and tracking costs and usage#2

gdorsi44 merged 2 commits into

gdorsi44:maingdorsi44/assistant-api-java:mainfrom

PawelSzpyt:tracking_bugfixing_and_refactoringPawelSzpyt/assistant-api-java:tracking_bugfixing_and_refactoringCopy head branch name to clipboard