/// Creates a new App builder.
Creates a new App builder.
Creates a new App builder .
pub fn new() -> Self {
    Self {
      invoke_handler: None,
      setup: None,
      config: Default::default(),
    }
  }
pub fn new ( ) -> Self { Self { invoke_handler : None , setup : None , config : Default :: default ( ) , } }
Creates a new App builder.
Creates a new App builder .