append {&rest lists} => result
list---each must be a proper list except the last, which may be any object.
result---an object. This will be a list unless the last list was not a list and all preceding lists were null.
append returns a new list that is the concatenation of the copies. lists are left unchanged; the list structure of each of lists except the last is copied. The last argument is not copied; it becomes the cdr of the final dotted pair of the concatenation of the preceding lists, or is returned directly if there are no preceding non-empty lists.
(append '(a b c) '(d e f) '() '(g)) => (A B C D E F G) (append '(a b c) 'd) => (A B C . D) (setq lst '(a b c)) => (A B C) (append lst '(d)) => (A B C D) lst => (A B C) (append) => NIL (append 'a) => A
section nconc [Function] , section concatenate [Function]
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