Executable XML users challenge

provide any LISP macro with clear explanation of its structure and function
that is :
1.concise (max 10 lines)
2.does not have a C equivalent(at least not anything above 100 lines)
3.does not use any libraries or imported complex functions which are not in C
If you provide an exact explanation/commentary on what it does i'll try to make a C solution which
is equivalent to LISP one. If i fail to do so, LISP wins, if i provide a solution you can make another macro.
If all examples in the thread are provide with C equivalents, LISP loses.

Ok, I want you to implement a special sorting algorithm. in this algorithm you will implement a list with floating point numbers and integers. return a list that floating point at the beginning and sorted, after that sorted odd numbers and finally sorted even numbers. oh and append "hello world" to end of the list

(setq l '(6 5 2.0 9 0.0 2 1 4.5 8))
(append (sort (remove-if #'integerp l) #'<) (sort (remove-if  #'evenp (remove-if #'floatp l)) #'<) (sort (remove-if  #'oddp (remove-if #'floatp l)) #'<) "Hello World")