The Cargo.toml content at the bottom of page 86 is from (path)/flappy_dragon/flappy_dragon_base/Cargo.toml and not (path)/flappy_dragon/Cargo.toml as stated.
The Cargo.toml content at the bottom of page 86 is from (path)/flappy_dragon/flappy_dragon_base/Cargo.toml and not (path)/flappy_dragon/Cargo.toml as stated.