Git rebase and commit squashing exercise

Objective

In this exercise we will practice how to squash incomplete commits into one nice commit and replay it on top of the master branch.

Motivation

This technique is useful in situations where you need to make changes to a pull request before it can be integrated.

Exercise

Start the exercise by forking and cloning the repository.

The haiku branch represents a feature branch that is to be rebased (moved) and squashed.

On the haiku branch you find a script that prints a haiku:

$ python main.py

This is our haiku:

On a branch ...
                  by Kobayashi Issa

              On a branch
              floating downriver
              a cricket, singing.

The haiku is great but the commit history on the haiku branch is not (on purpose):

$ git log --oneline

65870f9 fix a copy-paste error
47a007d completed the haiku
a3278e3 another incomplete commit
54fba21 startign to work on it (commit with a typo)
3ff39a1 forgot to add a file
7e1f903 starting working on the haiku
c50a463 initial commit

Your task is to rebase the haiku branch on top of master and squash the several small "incomplete" commits into one single self-contained cherry-pickable commit.

In other words instead of this history:

we wish to arrive at this history:

by first rebasing the commits:

and later squashing them.

Verify the history and also that the script still works after the operation.