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organize chapters for the ongoing research, remove dead links, add new resources

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advanced_expert/vulnerabilities/arithmetic_errors/README.md
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* solidity < 0.8: integers in overflow / underflow without any errors.
* solidity >= 0.8: default behaviour of for overflow / underflow is to throw an error.
* use **[SafeMath](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol)** to prevent arithmetic overflow and underflow.
<br>
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### chapters
<br>
* **[overflow](overflow)**