substring-move![procedure] substring-move! str1 start1 end1 str2 start2''
Guile: Copy the substring of str1 between
start1 and end1 into str2 beginning at
start2.
The same function can be achieved by SRFI-13's
string-copy!, but the different API:
(string-copy! str2 start2 str1 start1 end1)
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