The Uniswap codebase is available on GitHub at the following link:

https://github.com/Uniswap/uniswap-v2-core

To begin forking the Uniswap codebase, you will need to have a GitHub account and be familiar with using Git. Here are the basic steps to follow:

1. Go to the Uniswap GitHub repository (link above).
2. Click the “Fork” button in the top right corner of the page. This will create a copy of the Uniswap repository in your own GitHub account.
3. Clone the forked repository to your local machine. To do this, open a terminal and navigate to the directory where you want to store the code. Then, run the following command:

git clone https://github.com/[YOUR_USERNAME]/uniswap-v2-core.git

Replace [YOUR_USERNAME] with your actual GitHub username. This will download the code from the forked repository to your local machine.

4. Change into the directory of the cloned repository:

cd uniswap-v2-core

5. You can now begin making changes to the codebase as needed. When you are ready to commit your changes, use Git to stage and commit your changes, and then push them back to your fork on GitHub.

git add .
git commit -m "My changes"
git push

Note that this is just a basic outline of the process for forking the Uniswap codebase. There are many additional considerations and details involved in building and deploying a decentralized exchange based on Uniswap, and you will need to familiarize yourself with the codebase and the Ethereum platform in order to fully understand and work with the code.

Deploying and running the Uniswap code requires a few steps and some technical setup. Here is a general outline of the process:

1. Install and set up the necessary tools: In order to deploy and run the Uniswap code, you will need to have the following tools installed and set up on your local machine:

• Node.js: Uniswap is built using JavaScript, so you will need to have Node.js installed on your machine in order to run the code.
• Truffle: Truffle is a development framework for Ethereum that will be used to compile and deploy the Uniswap smart contracts.
• Ganache: Ganache is a local Ethereum blockchain that you can use for testing and development purposes. It is useful for testing your smart contracts before deploying them to the main Ethereum network.

2. Clone the Uniswap repository: If you have not already done so, you will need to clone the Uniswap repository to your local machine. See the previous answer for instructions on how to do this.
3. Install the necessary dependencies: Once you have the repository cloned to your local machine, you will need to install the necessary dependencies. From the root directory of the repository, run the following command:

npm install

This will install all of the necessary libraries and packages that the Uniswap codebase depends on.

4. Compile the smart contracts: Next, you will need to compile the Uniswap smart contracts. From the root directory of the repository, run the following command:

truffle compile

This will compile the smart contracts and generate the necessary artifacts.

5. Deploy the smart contracts: Once the smart contracts have been compiled, you can deploy them to your local Ethereum blockchain using Ganache. From the root directory of the repository, run the following command:

truffle migrate --reset --network ganache

This will deploy the smart contracts to your local Ganache blockchain.

6. Run the Uniswap frontend: Finally, you can run the Uniswap frontend by running the following command from the root directory of the repository:

npm run start

This will start the development server and open the Uniswap frontend in your web browser.

Note that this is just a high-level overview of the process for deploying and running the Uniswap code. There are many additional details and considerations involved, and you will need to familiarize yourself with the codebase and the Ethereum platform in order to fully understand and work with the code.