Readability Improvement

[AAAlex-123]

I want to enhance the readability of the notes you generously provided in three ways:

1. Flatten the file structure by moving every .kt to top level, since every directory has 1-2 files and the names of the files themselves convey enough information
2. Remove redundant whitespace from the source code
3. Add some comments in the source code, where necessary

Would you be interested in me performing such changes?