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Idiom #321 Access character in string, by index

Assign to c the value of the i-th character of the string s.

Make sure to properly handle multi-byte characters. i is the character index, which may not be equal to the byte index.

 c = s(i:i)
c := []rune(s)[i]
char c = s.charAt(i);
c := Utf8Copy(s,i,1);
c := s[i];
use utf8;
$c = substr $s, $i, 1;
c = s[i]
c = s[i]
let c = s.chars().nth(i).expect("s is too short");

New implementation...
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