feat: init the repo

src/price_transform/typprice.rs

@@ -0,0 +1,29 @@
+use crate::validation;
+use numpy::{IntoPyArray, PyArray1, PyReadonlyArray1};
+use pyo3::prelude::*;
+
+/// Typical Price: (high + low + close) / 3.
+#[pyfunction]
+pub fn typprice<'py>(
+    py: Python<'py>,
+    high: PyReadonlyArray1<'py, f64>,
+    low: PyReadonlyArray1<'py, f64>,
+    close: PyReadonlyArray1<'py, f64>,
+) -> PyResult<Bound<'py, PyArray1<f64>>> {
+    let highs = high.as_slice()?;
+    let lows = low.as_slice()?;
+    let closes = close.as_slice()?;
+    let n = highs.len();
+    validation::validate_equal_length(&[
+        (n, "high"),
+        (lows.len(), "low"),
+        (closes.len(), "close"),
+    ])?;
+    let result: Vec<f64> = highs
+        .iter()
+        .zip(lows.iter())
+        .zip(closes.iter())
+        .map(|((&h, &l), &c)| (h + l + c) / 3.0)
+        .collect();
+    Ok(result.into_pyarray(py))
+}