Day 1

⚠️ Important Note

We use clone() in this example, but we are not claiming it is the optimal approach. The goal here is to present a solution that helps illustrate Rust's ownership system in a simple way. As the story unfolds in the next challenge, we'll dive into more efficient patterns. This example is intentionally simplified for the sake of education and storytelling.

Enjoy!

The Story

It's 1st December and the countdown has just begun. The elves are busy preparing for the Christmas and Santa is busy checking the list of children who have been good this year. It was supposed to be a smooth day until all of a sudden two of santa's elves burst into Santa's office with a problem.

“Santa!” one of the elves shouted. “The code won’t compile! We’ve hit a wall, and it’s all Rust’s fault!”

Santa, sipping his triple-shot peppermint latte, raised an eyebrow. “Rust’s fault? Or your fault?”

“It’s the ownership rules!” the other elve blurted. “I think we violated them, we’re used to Python, where variables just... work. Look at this!”

Your Mission

The elves have tried their best but the code doesn't compile.

You need to find a way to make the code compile without changing the attach_message_to_present function.

Hints

Use clone() to create a clone of the gift_message and pass it to the function.

Editor not available on Mobile!

In order to solve the challenge, please visit this page on a desktop computer.

Solutions

tdoan

5 hours ago

339.92ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Denis Kolegov

dnkolegov

5 hours ago

392.48ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

João Paiva

jgpaiva

11 hours ago

340.36ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Ephraim

EphraimBsB

15 hours ago

373.08ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

s-umn04

16 hours ago

354.22ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Sherlock

anjiava

18 hours ago

384.22ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

henopied

19 hours ago

384.01ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

henopied

19 hours ago

331.72ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

lianweiting1995

19 hours ago

360.13ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

mmgajda

19 hours ago

365.69ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Mingzhe Yang

mei28

20 hours ago

370.19ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Yevhen Bilyk

jiztastamablastamarang

a day ago

340.10ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Sergey Sonkin

sergey-sonkin

a day ago

396.73ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Ducky2048

a day ago

346.98ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

zcfxx

2 days ago

351.92ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

mliertzer

2 days ago

349.82ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

doroshtapgh

2 days ago

377.21ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Deaddy3

2 days ago

345.61ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Chenyao Yu

chenyaoy

2 days ago

347.81ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

zahrajavar

2 days ago

385.61ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Patrick Gray

pgray

2 days ago

477.26ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Y.

klllr

2 days ago

363.24ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Naoyuki Yamada

chokkoyamada

2 days ago

335.89ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Naoyuki Yamada

chokkoyamada

2 days ago

408.75ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

pilotso11

2 days ago

362.29ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

David Griffin

findgriffin

2 days ago

526.96ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

pwhenryuk

2 days ago

354.38ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Sanket6652

2 days ago

423.87ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Habu

habu1010

2 days ago

335.63ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Rickard Jensen

rjensen

2 days ago

367.10ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Ankit Kumar Jha

Ankit8848

2 days ago

368.88ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Pumkko

2 days ago

359.49ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Taras

rodynenko

3 days ago

430.55ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Egor

Flash-Kaa

3 days ago

425.74ms

98.44kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone());
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

migusmp

3 days ago

351.59ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Ankeet Parikh

ankeetparikh

3 days ago

368.79ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Emmanuel Guefif

eguefif

3 days ago

362.52ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Pascal Perrenoud

MrDaves24

3 days ago

364.26ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

duuinh

4 days ago

413.15ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Salman Mehmood

saltheman

4 days ago

420.44ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Masayuki Sunahara

tamanishi

4 days ago

386.02ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Harald Gliebe

hagl

4 days ago

344.85ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

hafihaf123

4 days ago

333.20ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

LeGrandMendes

4 days ago

388.10ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

KLcpb

4 days ago

354.06ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Bear

thebearpark

4 days ago

328.67ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Sreyas Sabbani

sreyassabbani

4 days ago

361.70ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Sergey Kuznetsov

kuznetsss

4 days ago

358.66ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

aidan1magee

4 days ago

333.05ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}

Mor8

4 days ago

332.88ms

98.47kb

pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    attach_message_to_present(gift_message.clone()); // <-- Add a `.clone()` here!
    println!("{}", gift_message);
}
// Don't change this function!
pub fn attach_message_to_present(message: String) {
    println!("The present now has this message: {}", message);
}