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