1.2)
and to run its unit tests → the tests were removed by a commit on June 1

2.1)
on its own branch → in their own branches
this branch is → these branches are

2.2)
should implements → should implement

2.3)
the tests are gone

2.4)
There is no Commit button on the command line

3.1)
local branch name → local branch named
Switch you your → Switch to your

3.2)
Implement the multiple operation → Implement the multiply operation

3.3)
working at → working on
commmit → commit

3.4)
17→4.4 mentions to leave the amend commit message as it is. That should probably be mentioned here too.

3.5)
Fixing the commit message → Fix the commit message
and via the → and run