Now here is where it gets confusing:
a) Can you do that in C ? (C++ is OO so I mention C.
(Actually I get the
impression from C programmers that you can do anything in C but it
will take longer)
b) Is it possible, to implement object oriented concepts in a
procedural language?

I get your point that it is easier to create code  in OO languages,
and easier to manipulate 'procedures' - classes. OK

My point about compilation is that in either case procedural or OO
language created code, the compiled code is just a set of
instructions fed to the processor but the OO language created code is
longer and less efficient and maybe containing a lot of redundancy?