* Initial Commit - Ports and Adapters
* Restructured code to implement input and outbou ports and adapters
* Added tests for groupingBy Collector
* Revert "Initial Commit - Ports and Adapters"
This reverts commit 55152dea
* Added tests for groupingBy Collector
* reverting
* corrected typo
* used BDD naming strategy for tests
* Added a test for groupingByConcurrent
* added new module and package
* added core-java-streams-4 module in main pom.xml
* updated pom.xml and changed artifactId
devanshtrivedi5