use git_object::borrowed;use std::path::PathBuf; /// A database for reading and writing objects to disk, one file per object.pub struct Db {    /// The directory in which objects are stored, containing 256 folders representing the hashes first byte.    pub path: PathBuf,} /// Initializationimpl Db {    /// Initialize the Db with the `objects_directory` containing the hexadecimal first byte subdirectories, which in turn    /// contain all loose objects.    ///    /// In a git repository, this would be `.git/objects`.    pub fn at(objects_directory: impl Into<PathBuf>) -> Db {        Db {            path: objects_directory.into(),        }    }} pub(crate) fn sha1_path(id: borrowed::Id<'_>, mut root: PathBuf) -> PathBuf {    match id.kind() {        git_hash::Kind::Sha1 => {            let hex = id.to_sha1_hex();            let buf = std::str::from_utf8(&hex).expect("ascii only in hex");            root.push(&buf[..2]);            root.push(&buf[2..]);            root        }    }} ///pub mod iter;///pub mod locate;///pub mod write;