Created
September 6, 2011 03:49
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programming-praxis remove dup chars
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| ;; solution for part 1 http://programmingpraxis.com/2011/09/02/two-string-exercises/ | |
| (defun rdup (str) | |
| (defun rdup_ (str res) | |
| (if (null str) | |
| res | |
| (if (member (car str) res) | |
| (rdup_ (cdr str) res) | |
| (rdup_ (cdr str) (append res (list (car str))))))) | |
| (concat (rdup_ (string-to-list str) '()))) | |
| (rdup "aabbccd") |
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