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

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

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

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