robi_dev_say_hello/
lib.rs

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pub fn say_hello(name: &str) -> String {
    return format!("Hello, {}!", name);
}

pub fn say_hello_to_everyone() -> String {
    return "Hello, everyone!".to_string();
}

pub fn say_goodbye(name: &str) -> String {
    return format!("Goodbye, {}!", name);
}

pub fn say_goodbye_to_everyone() -> String {
    return "Goodbye, everyone!".to_string();
}