High school sweetheart

[depial]

This is the concept exercise high-school-sweetheart to accompany the concept function compsition(#821). This has been taken from the crystal version with minor modifications made for the Julia language. Also the word 'ASCII' has been replaced by 'unicode', since this is more accurate.

The introduction.md has been left blank, to be filled in once the about.md is made for the concept.

[depial]

As this was taken from the Crystal version, which I believe is meant as a string method concept exercise, instructions.md and hints.md need some updating to better highlight the ideas of function composition.

[colinleach]

Hmmm... I'm trying to remember why I put this down as a possible exercise for this concept. Gleam uses it for the pipe-operator concept, which may be relevant. Dow that have a more useful set of documents?

This is the list I've been working from.

[depial]

It's quite fine for function composition, since it allows for use of the function composition operator, as well as piping and nesting. Actually, my first exemplar.jl used the composition operator, but I reverted to more explicit function calls for clarity.

I think I'll change the exemplar to include varied function composition techniques.

instructions.md and hints.md just need to be modified for the change in emphasis, which I'll be happy to do. I just wanted to get things up for collaboration's sake.

[colinleach]

My brain is pretty frazzled after the recent booleans fiasco, so I'm reluctant to touch anything at the moment. It will be better/safer if I look at this tomorrow, if that's OK with you.

It's probably best if you make the introduction.md while you have your head into the exercise. It should just mean deleting stuff, which is a lot quicker and easier than writing it.