Function store_path_name 

pub unsafe extern "C" fn store_path_name(
    store_path: *const StorePath,
    callback: get_string_callback,
    user_data: *mut c_void,
)

@brief Get the path name (e.g. “” in /nix/store/-)

@param[in] store_path the path to get the name from @param[in] callback called with the name @param[in] user_data arbitrary data, passed to the callback when it’s called.