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how to concatenate two &str in rust

// using 2 variables
let new_string = format!("{}{}", first_string, second_string);
// using 2 literals
let new_string = format!("{}{}", "first string ", "second string");
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rust concatenate strings

let text1 = "hello".to_owned();
let text2 = text1 + " world";
println!("{}", text2);
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concat string rust

fn main() {
  let mut string = String::from("Hello");

  string.push_str(" World");
  
  println!("{}", string);
}
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