Rust 如何创建字符串而不是将其打印到标准输出？_Rust

Rust 如何创建字符串而不是将其打印到标准输出？

rust

Rust 如何创建字符串而不是将其打印到标准输出？,rust,Rust,考虑以下功能： use std::io; pub fn hello() { println!("Hello, How are you doing? What's your characters name?"); let mut name = String::new(); io::stdin().read_line(&mut name).expect("Failed to read name. What was that name again?");

考虑以下功能：

use std::io;

pub fn hello() {
    println!("Hello, How are you doing? What's your characters name?");

    let mut name = String::new();

    io::stdin().read_line(&mut name).expect("Failed to read name. What was that name again?");

    println!("Welcome to the castle {}", name);
}

最后一个

println怎么取并将其转换为“欢迎来到城堡{}”
并将{}
替换为名称
（显然，我需要将->字符串
添加到函数声明中。）
使用宏
pub fn hello() -> String {
    println!("Hello, How are you doing? What's your characters name?");

    let mut name = String::new();

    io::stdin().read_line(&mut name).expect("Failed to read name. What was that name again?");

    format!("Welcome to the castle {}", name)
}