fn default() -> Self {
        Self {
            links: vec![HashMap::new()],
        }
    }
/// Creates an empty trie with a root node.
Creates an empty trie with a root node.
Creates an empty trie with a root node .
fn default() -> Self {
        Self {
            links: vec![HashMap::new()],
        }
    }
fn default ( ) -> Self { Self { links : vec ! [ HashMap new ( ) ] , } }
Creates an empty trie with a root node.
Creates an empty trie with a root node .