- Chance get_next_collision function to take current_boundry as a parameter
avoid some rounding, also save unnecessary calculation by putting this as a if-else statement
- refactor some if-else statement, better reuse of code in the future
- code for reflection on circles (r>=1/2) with bugs
- debug code and make simulation - get this to work correctly!
- save simulation pics
- note: red is incoming, green is exiting