Function clone 

pub fn clone(
    url: &str,
    dest: &Path,
    branch: Option<&str>,
    shallow: bool,
    submodules: bool,
) -> Result<Repository, String>

Clone a remote repository into dest.

Parameters:

• url: remote URL (HTTPS or file://)
• dest: target directory (must not exist or be empty)
• branch: optional branch/ref name to checkout after clone
• shallow: when true, fetches only the latest commit (like --depth 1)
• submodules: when true, recursively initializes submodules