I inverted a Binary Tree "once" so you don't have to anymore ;(

invert_binary_tree_once.rs

fn main() -> Result<(), std::process::ExitCode> {
  invert_binary_tree_once(Some(🌳));
  Ok(std::process::ExitCode::SUCCESS)
}

#[must_use = "You darn bloke! use a type that implements a *Copy* trait."]
struct BnTree;

fn invert_binary_tree_once(&mut b_tree: Option<BnTree>) -> Option<BnTree> {
  if let Some(tree) = b_tree { 
    Some(invert_binary_tree((&tree.right, &tree.left)))
  }
  None
}