Creating implementation for idiom 289 : Concatenate two strings

Idiom

# 289 Concatenate two strings

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Create the string s by concatenating the strings a and b.

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S : constant String := A & B;

(def s (str a b))

#include <iostream>
#include <string>

std::string a{"Hello"};
std::string b{"world"};
auto s = a + b;

string s = String.Concat(a,b);

string s = a + b;

var s = '$a$b';

var s = a + b;

s = a <> b

s = a // b

s := a + b

s = a <> b

s = a ++ b

const s = a + b;

String s = a.concat(b);

String s = a + b;

String s = String.format("%s%s", a, b);

val s = a + b

local s = a..b

$s = $a.$b;

s := a + b;

my $s = $a . $b;

s = a + b

s = a + b

let s = a + b;

let s = format!("{}{}", a, b);

s = a & b