Function dates

crates/openquant/tests/backtest_statistics.rs:6–9

(n: usize, start: &str, days: i64)

use std::path::Path;

fn dates(n: usize, start: &str, days: i64) -> Vec<NaiveDateTime> {
    let base = NaiveDate::parse_from_str(start, "%Y-%m-%d").unwrap().and_hms_opt(0, 0, 0).unwrap();
    (0..n).map(|i| base + Duration::days(i as i64 * days)).collect()
}

fn load_dollar_bar_sample() -> Vec<(NaiveDateTime, f64)> {
    let path = Path::new(env!("CARGO_MANIFEST_DIR"))