The code is 3 years old and it should be refactored. This includes: - avoiding singletons using DI via constructor - removing [`Constants.java`](https://github.com/WeLoveOpenSourcePlugins/memory/blob/v1.2.0/src/main/java/de/paul2708/memory/util/Constants.java) - split code and resources #2 - correcting checkstyle violations - ... and anything else you would find
The code is 3 years old and it should be refactored.
This includes:
Constants.java