There are two branches, master branch and add branch, on this repository. The master branch contains a skeleton code for a calculator (the same one as the assignment), and the add branch contains the skeleton code and the implementation of add function. You will make two pull requests, one for the master branch and one for the add branch.

1. Fork this repository and clone the fork into your local machine.
2. Make a new branch calc1 from the master branch and checkout to it.
3. Implement add, sub, and mul function, while making one commit for each function. This means, you should make three commits in total.
4. Push your branch into origin repository and make a pull request to the master branch of the upstream repository(this repository) from your calc1 branch.

5. Checkout to a new branch calc2 from the calc1 branch.
6. Squash the three commits you have made and push it into the calc2 branch of your fork.
7. Since add function is already implemented in the add branch, there will be a conflict between the add branch and calc2 branch.
8. Resolve the conflict and make a pull request to the add branch of the upstream repository from your calc2 branch.

• Note that the two pull requests should not contain any conflicts after you finish all the steps.