Exercise: add numbers

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Given a file like this:

examples/regex/grades1.txt

Foo:1
Foo:2
Foo:3
Foo:4
Foo:5
Foo:6
Foo:7
Foo:8
Bar:23
Foo:23
Foo:11
Foo:9
Bar:8
Zorg:7

• Add up the scores for each name and print the result.

Foo   : 79
Bar   : 31
Zorg  :  7

• Make it work also on a file that looks like this:

examples/regex/grades2.txt

# Let's start with Foo:1

Foo:1
Foo: 2
Foo :3
Foo : 4
  Foo:5
  Foo: 6
  Foo :7
  Foo : 8

# Let's start Bar with : 23
Bar:23

Foo: 23
Foo:   11
   Foo  : 9
  Bar:  8
Zorg: 7