New implementation

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Other implementations
T : String := S (I .. J - 1);
#include <stdlib.h>
#include <string.h>
char *t=malloc((j-i+1)*sizeof(char));
(def t (subs s i j))
#include <string>
auto t = s.substr(i, j-i);
var t = s.Substring(i, j - i);
auto t = s[i .. j];
var t = s.substring(i, j);
t = String.slice(s, i..j-1)
T = string:sub_string(I, J-1).
character(len=:), allocatable :: t

  t = s(i:j-1)
t := string([]rune(s)[i:j])
def t = s[i..<j]
t = drop i (take j s)
let t = s.substring(i, j);
let t = s.slice(i, j);
String t = s.substring(i,j);
(setf u (subseq s i j))
t = s:sub(i, j-1)
@import Foundation;
t=[s substringWithRange:NSMakeRange(i,j-i)]
$t = mb_substr($s, $i, $j-$i, 'UTF-8');
t := copy(s,i+1,j-i);
uses Sysutils;
t := s.Substring(i,j-i);
my $chunk = substr("now is the time", $i, $j);
t = s[i:j]
t = s[i..j-1] 
extern crate unicode_segmentation;
use unicode_segmentation::UnicodeSegmentation;
let t = s.graphemes(true).skip(i).take(j - i).collect::<String>();
use substring::Substring;
let t = s.substring(i, j);
Dim t As String = s.Substring(i,j)