Move implementation to `src` dir #223

	name: Library ON Push & PR DO Code check
	on:
	pull_request:
	push:
	branches:
	- "main"

	jobs:
	code-check:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Setup Flutter
	uses: subosito/flutter-action@v2
	with:
	channel: "stable"

	- name: Check Flutter SDK version
	run: flutter --version

	- name: Get dependencies
	run: flutter pub get

	- name: Custom lint
	run: dart run custom_lint

	- name: Check formatting
	run: dart format . --set-exit-if-changed

	- name: Run tests
	run: \|
	# run tests if `test` folder exists
	if [ -d test ]
	then
	flutter test -r expanded
	else
	echo "Tests not found."
	fi

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