blit-string![procedure] blit-string! s1 o1 s2 o2 len
Bigloo: Fill string s2 from position o2 and length len with the string s1 from position o1.
SRFI-13 has string-copy!, which can be used in place of
this. I think it is equivalent if you call:
(string-copy! s2 o2 s1 o1 (+ o1 len))
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