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Programming-Idioms

Print a line "Char i is c" for each character c of the string s, where i is the character index of c in s (not the byte index).

Make sure that multi-byte characters are properly handled, and count for a single character.
New implementation

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To emphasize a name: _x → x

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Other implementations
(dorun (map-indexed (fn [i c] (println "Char" i "is" c)) s))

In Clojure a string is a list of characters