Added support for multi-line strings, fix bug where statements consisting of a single string throws syntax error.

[JJtan2002]

• Fix issue8.

• Cleaning up code

• Reduced nested conditionals

• Update tokenizer.ts

• Fixed typo

• Fixed typos

[Fidget-Spinner]

@JJtan2002 you shouldnt make a pull request to merge into feature branches. You can either run

git merge origin/main

or

git pull origin main

To merge main in