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The zipping function
zipping.scm
The function zip.
Expression

 Value

(zip cons '(1 2 3) '(a b c))
 
((1 . a) (2 . b) (3 . c))
(apply string-append
 (zip 
  string-append
  '("Rip" "Rap" "Rup")
  '(", " ", and " "")))
 
"Rip, Rap, and Rup"
(string-merge 
  '("Rip" "Rap" "Rup") '(", " ", and "))
 
"Rip, Rap, and Rup"