Format and lint source code

[nguyenhuy0905]

Format and lint source code

IMPORTANT: only review this after you have merged #24.

• What:

I formatted and linted all files in the directory src.

• Why:

I created the new format and lint script, I should use it.

• How:

I used the convenience script clang-format-lint-all

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Pull request by: Huy Nguyen