Add titleize method to String.

[hugopl]

If you guys like the idea I can add tests to this PR.

This is similar titleize method Rails[1] add to Ruby strings, however with a difference:

Rails replaces the - by spaces from words, but this doesn't work on all languages, e.g. in portuguese "fala-se muito" should be "Fala-se Muito", not "Fala Se Muito" as rails does.

So this titleize just upcase letters after whitespaces, similar to already existing capitalize method.

[1] https://apidock.com/rails/ActiveSupport/Inflector/titleize

[j8r]

Missing specs (you can take the examples in the method description).

[bcardiff]

Besides adding some specs, move it nearer the capitalize, upcase, downcase methods.

[hugopl]

Besides adding some specs, move it nearer the capitalize, upcase, downcase methods.

👍

[straight-shoota]

Maybe this should preserve upper case characters? This would be useful for abbreviations. The current behaviour can be achieved with downcase.titelize.

[hugopl]

Maybe this should preserve upper case characters? This would be useful for abbreviations. The current behaviour can be achieved with downcase.titelize.

Preserve case makes sense to me, but I'm really not sure about what would be better. capitalize don't do this and downcase everything but first letter. I would like to listen what other reviewers think about it.