Weird ERC20 Implementation survey

## Summary
> Please give a short summary of this research topic.

We implement a standard ERC20 token in our assignment, however, there are lots of implementation that is not coherent to the common ERC20 implementation. It might lead to some issues when interacting with such tokens, please research into these token and provide an analysis.

## Description
> Please provide a detailed description to the topic.

Please analyze analyze existing non-standard ERC20 token, what is their property, and how it might affect protocol or user. You can check `resource` section for more information.

## Resource
> Please provide related resource for the topics, including articles, research papers and more.

[weird-erc20](https://github.com/d-xo/weird-erc20)

[Auditor’s Notes: ERC20 Integration Tips](https://blog.pessimistic.io/auditors-notes-erc20-integration-tips-3b150021b8c0)

## Others
> Please provide more information if there is any.

None