✅ 13. 02_basic_calculator/10_as_casting
✅ 14. 03_ticket_v1/00_intro
✅ 15. 03_ticket_v1/01_struct
✅ 16. 03_ticket_v1/02_validation
✅ 17. 03_ticket_v1/03_modules
✅ 18. 03_ticket_v1/04_visibility
✅ 19. 03_ticket_v1/05_encapsulation

✅ 11. 02_basic_calculator/08_overflow
✅ 12. 02_basic_calculator/09_saturating

✅ 4. 02_basic_calculator/01_integers
✅ 5. 02_basic_calculator/02_variables
✅ 6. 02_basic_calculator/03_if_else
✅ 7. 02_basic_calculator/04_panics
✅ 8. 02_basic_calculator/05_factorial
✅ 9. 02_basic_calculator/06_while
✅ 10. 02_basic_calculator/07_for

✅ 3. 02_basic_calculator/00_intro

✅ 1. 01_intro/00_welcome
✅ 2. 01_intro/01_syntax