The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-node@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

When fallback is not payable you will not be able to receive ether

Fallback function must be simple

Explicitly mark visibility of state

Avoid to use inline assembly. It is acceptable only in rare cases

Avoid to use inline assembly. It is acceptable only in rare cases