T1-AUD Search for basic vulnerabilities on gabai code

[henry-hz]

This repo has a list of the most common smart-contract vulnerabilities. This task is to check our code for all of the relevant vulnerabilities, so I suggest the following order:

• read all the vulnerabilities code following the code to all function calls
• follow the money flow during the reading
• add in your task document the vulnerabilities that you thought that are relevant
• compare with your code
• if you find a vulnerability, write down the before and after code
• if needed write a new test on your test file to prove your code is not vulnerable anymore