[contract] add comments to vm.go and vm_callback.go #60

	# This workflow will build a golang project
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go

	name: Short Unit Tests

	on:
	push:
	branches-ignore: # master and develop run complete test by other workflow
	- master
	- develop

	jobs:
	pre_job:
	# continue-on-error: true # Uncomment once integration is finished
	runs-on: ubuntu-latest
	# Map a step output to a job output
	outputs:
	should_skip: ${{ steps.skip_check.outputs.should_skip }}
	steps:
	- id: skip_check
	uses: fkirc/skip-duplicate-actions@v5
	with:
	# All of these options are optional, so you can remove them if you are happy with the defaults
	concurrent_skipping: 'never'
	skip_after_successful_duplicate: 'true'
	paths_ignore: '["/README.md", "/docs/*", "Docker", "Dockerfile"]'
	do_not_skip: '["workflow_dispatch"]'

	build_and_unittest:
	needs: pre_job
	if: needs.pre_job.outputs.should_skip != 'true'

	runs-on: ubuntu-latest

	steps:

	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	submodules: 'recursive'

	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: 1.19

	- name: Install dependencies
	run: \|
	sudo apt-get install -y jq m4 make cmake

	- name: Build
	run: make

	- name: Short Unit Tests
	run: go test -short -timeout 999s -v ./...

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