Unit Tests for all functions

[YeabsiraNigusse]

almost all functions are tested and exits in different file according to their functionality

• two RTE helper functions(iterator and orSubTreeElegance) didn't return the intended result
• iterator return deterministic result and orSubTreeElegance return incorrect result compared to python

[YeabsiraNigusse]

@Yagth, yes everything is working on my branch and i pull changes from the main branch before sending pull request. the number of file changed increased due to commit from WSL terminal which i was not committing changes before. i accidentally commit and push from that terminal and a lot of changes get into the file but technically there is no difference on the repo since i was using the same folder for the two terminals. if there is anything i should test let me know. you can also switch to my branch and check if everything is working.