Extract demo

[14NGiestas]

No description provided.

[14NGiestas]

Ok, @jvdp1 I've created this PR on my own fork of stdlib just to see if that pull/665 would fix the entire PR pull/662 so we don't need to wait as much.
The "fpm CI" it's satisfied but intel compilers don't allow the formatted IO using the '(A)' (character) descriptor. I guess either changing it to '(DT)' descriptor or just "importing" the write(unformatted) and then printing using print*, will do the trick.

I'll go ahead and push a few commits in your extract_demo branch then I will re-run the CI to see if the problem is gone or if there's anything else to fix.

You can see the intel CI here

The following tests FAILED:
	232 - padl (Failed)
	233 - padr (Failed)
	234 - replace_all (Failed)

[14NGiestas]

Great, now the example with padr passes which means using DT instead of A makes intel Fortran happy

Errors while running CTest
The following tests FAILED:
	232 - padl (Failed)
	234 - replace_all (Failed)