Function run_algo 

pub fn run_algo(
    db_dir: &Path,
    subcmd: &AlgoSubcmd,
    top: usize,
    dir: AlgoDir,
    edge_types: Vec<String>,
    weight_prop: Option<String>,
    min_weight: Option<f64>,
) -> Result<String, CliError>

Run a graph algorithm and return a formatted string.

dir selects the edge direction for degree and pagerank; wcc and communities are always undirected and ignore it. edge_types / weight_prop / min_weight are used by communities only.