You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ssh_authorizedkeys.rs
    path of file: ./repos/kanidm/tools/cli/src
    
    the code of the file until where you have to start completion: #![deny(warnings)]
#![warn(unused_extern_crates)]
#![deny(clippy::unwrap_used)]
#![deny(clippy::expect_used)]
#![deny(clippy::panic)]
#![deny(clippy::unreachable)]
#![deny(clippy::await_holding_lock)]
#![deny(clippy::needless_pass_by_value)]
#![deny(clippy::trivially_copy_pas
    
fn k_client_builder() -> Result<KanidmClientBuilder, ()> {
    use kanidm_proto::constants::{DEFAULT_CLIENT_CONFIG_PATH, DEFAULT_CLIENT_CONFIG_PATH_HOME};
    use tracing::debug;

    let config_path: String = shellexpand::tilde(DEFAULT_CLIENT_CONFIG_PATH_HOME).into_owned();

    debug!("Attempting to use config {}", DEFAULT_CLIENT_CONFIG_PATH);
    KanidmClientBuilder::new()
        .read_options_from_optional_config(DEFAULT_CLIENT_CONFIG_PATH)
        .and_then(|cb| {
            debug!("Attempting to use config {}", config_path);
            cb.read_options_from_optional_config(config_path)
        })
        .map_err(|e| {
            error!("Failed to parse config (if present) -- {:?}", e);
        })
}