Exercise: parse hours log file and give report

The log file looks like this

{% embed include file="src/examples/regex-perl/timelog.log)

the report should look something like this:

09:20-11:00 Introduction
11:00-11:15 Exercises
11:15-11:35 Break
...


Solutions                   95 minutes   9%
Break                       65 minutes   6%
...