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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];
LazUtf8
c := Utf8Copy(s,i,1);
c = s[i]
c = s[i]
c := []rune(s)[i]

s is assumed valid UTF-8.
Convert s to a slice of rune.
let c = s.chars().nth(i).expect("s is too short");
 c = s(i:i)

Multibyte characters are handled with a different KIND in Fortran characters.
New implementation...
< > ⌨
programming-idioms.org 
c := s[i];
c := Utf8Copy(s,i,1);
c = s[i]
c = s[i]
c := []rune(s)[i]
let c = s.chars().nth(i).expect("s is too short");
 c = s(i:i)
char c = s.charAt(i);
use utf8;
$c = substr $s, $i, 1;