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/usr/lib/help/string-unsplit is in scheme9 2013.11.26-1.

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S9 LIB  (string-unsplit char list)  ==>  string

Unsplit a list of strings, giving a new string. CHAR is placed between
each two elements of LIST.

(string-unsplit #\: '("" "a" "b" "" "c"))  ==>  ":a:b::c"