yanhx / rareskills-week3

• Re-implement Uniswap V2 with the following requirements
• use solidity 0.8.0 or higher. You need to be conscious of when the original implementation originally intended to overflow in the oracle
• Use the Solady ERC20 library to accomplish the LP token, also use the Solady library to accomplish the square root
• The uniswap re-entrancy lock is not gas efficient anymore because of changes in the EVM
• Your code should have built-in safety checks for swap, mint, and burn. You should not assume people will use a router but instead directly interface with your contract
• The swap function should not support flash swaps, you should build a separate flashloan function that is compliant with ERC-3156
• Don’t use safemath with 0.8.0 or higher
• You should only implement the factory and the pair (which inherits from ERC20), don’t implement other contracts
• Write a markdown file explaining how to use the TWAP oracle with Uniswap V2. You need to answer the following questions:
  • Why does the price0CumulativeLast and price1CumulativeLast never decrement?
  • How do you write a contract that uses the oracle?
  • Why are price0CumulativeLast and price1CumulativeLast stored separately? Why not just calculate ``price1CumulativeLast = 1/price0CumulativeLast`?