Fix typo in Rust tree traversal.
Fix typo in Rust tree traversal.

Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,Gathros/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,leios/algorithm-archive,Gathros/algorithm-archive