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Uniswap is a Decentralized Exchange, running on the Ethereum blockchain (Mainnet and a few more) We are going to focus on swapping between different tokens using forking forking. We will use the fork to test out the implementation of the UnisWap smart contract. The contract is designed to swap between different ERC-20 tokens and get back the tokens that the pair exchange allows traders to exchange with each other. In this article, we will use forking the mainnet to test our smart contract implementation. We are using the fork forking to test the implementation for the first time.