Macro println_success 

macro_rules! println_success {
    ($($arg:tt)*) => { ... };
}

Prints a success message with green background and white text.

Supports format string syntax like format! macro:

• println_success!("Hello") - Simple string
• println_success!("Hello {}", name) - Positional arguments
• println_success!("Hello {name}") - Named arguments (Rust 1.58+)