Make Discount a struct to resemble class in C++. #18

	name: Test C

	on:
	push:
	paths:
	- 'C/**'
	- '.github/workflows/C.yml'
	pull_request:
	paths:
	- 'C/**'
	- '.github/workflows/C.yml'

	jobs:
	build:
	runs-on: ubuntu-latest

	env:
	DB_USER: root
	DB_OLD_PASSWORD: root
	DB_PASSWORD: mysql

	steps:
	- name: Check out the repo
	uses: actions/checkout@v3

	- name: Start MYSQL and import DB
	run: \|
	sudo systemctl start mysql
	mysqladmin --user=${{ env.DB_USER }} --password=${{ env.DB_OLD_PASSWORD }} password ${{ env.DB_PASSWORD }}
	mysql -u${{ env.DB_USER }} -p${{ env.DB_PASSWORD }} < ${GITHUB_WORKSPACE}/build/Database/initDatabase.sql

	- name: Set up dependencies
	working-directory: C
	run: \|
	sudo apt-get update
	sudo apt-get install libcmocka-dev
	sudo apt-get install libmysqlclient-dev

	- name: Build
	working-directory: C
	run: make build

	- name: Test
	working-directory: C
	run: \|
	rm tests/e/CheckoutTest.c
	make test
	mysql -u${{ env.DB_USER }} -p${{ env.DB_PASSWORD }} -e "select * from myShop.RECEIPT"

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