hii ,
i just read your task discription and you need a LISP programmer i am the one , I think i can deliver this task perfectly.
you can check my profile i have done a leatest project regarding trees in Racket (a family of LISP) : https://www.freelancer.com/projects/algorithm/Scheme-DrRacket-binary-Search-Tree
i have 3 years of experience as software developer and i am confident that i can help you in the task .
although i am a new freelancer but it does not describe my capability , just give me a chance to work for you i will give my best and provide a neat and nice solution.
Regards
Rohit K