Defi-Exchange
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I get this error with the line as shown. It cannot read 'from' in the const zero = BigNumber.from(0); Any way to solve this? 
added whitelist and nfts contracts to be able to unit test, removed waffle following https://hardhat.org/hardhat-runner/docs/guides/migrating-from-hardhat-waffle, added exchange unit tests, removed unused contracts and scripts I am practicing how to write...
Removing the extra "i" in liquidity
in the getAmountOfTokens function - smart contract
Repeated line of code that doesn't need to be there.
Fix code comments typo in README.md and hardhat-tutorial/contracts/Exchange.sol