pub fn say_hello(name: &str) -> String {
format!("Hello, {}!", name)
}
pub fn say_hello_everyone(name: &str) -> String {
"Hello, everyone!".to_string()
}
pub fn say_goodbye(name: &str) -> String {
format!("Goodbye, {}!", name)
}
pub fn say_goodbye_everyone(name: &str) -> String {
"Goodbye, everyone!".to_string()
}