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(defun string-to-clist (str)
(coerce str 'list))
(defun clist-to-string (clist)
(if (atom clist)
(string clist)
(coerce clist 'string)))
(defun split-by-first (lst delim)
"Splits LST by the first instance of DELIM"
(let ((pos (position delim lst)))
(if pos
(cons (subseq lst 0 pos) (list (subseq lst (+ pos 1))))
(error (format nil "No instance of ~a was found in ~a" delim lst)))))
(defun split-by-completely (lst delim)
(if (or (null lst) (not (cdr lst)))
(cons (list (car lst)) nil)
(if (member delim lst)
(destructuring-bind (first rest) (split-by-first lst delim)
(cons first (split-by-completely rest delim)))
(list lst))))
(defun get-lines (input-string)
(with-input-from-string (s input-string)
(loop for line = (read-line s nil)
while line
collect line)))
(defun id (x) x)
(defun remove-nth (n lst)
(if (or (null lst) (= n 0))
(cdr lst)
(cons (car lst)
(remove-nth
(- n 1)
(cdr lst)))))
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