pub fn init(file_name: Option<&str>) {
    let mut manager = MANAGER.as_ref().lock().unwrap();
    let file_name = file_name.unwrap_or("settings.json");
    manager.content = Some(Manager::new(file_name));
}
// Init settings manager with the desired settings file,
// will be created if does not exist
Init settings manager with the desired settings file,
will be created if does not exist
Init settings manager with the desired settings file will be created if does not exist
pub fn init(file_name: Option<&str>) {
    let mut manager = MANAGER.as_ref().lock().unwrap();
    let file_name = file_name.unwrap_or("settings.json");
    manager.content = Some(Manager::new(file_name));
}
pub fn init ( file_name : Option < & str > ) { let mut manager = MANAGER . as_ref ( ) . lock ( ) . unwrap ( ) ; let file_name = file_name . unwrap_or ( " " ) ; manager . content = Some ( Manager :: new ( file_name ) ) ; }
Init settings manager with the desired settings file,
will be created if does not exist
Init settings manager with the desired settings file will be created if does not exist
file_name
Option<&str>