chore: update demo to the latest cookiecutter-robust-python

Author: 56kyle

.cookiecutter.json

@@ -1,5 +1,5 @@
 {
-  "_commit": "38dcdc32c1ae8d68c230140b81036716e8d3f0b6",
+  "_commit": "5d756a871ab41b11e3501fbd7b59297c92371b66",
   "_template": "C:\\Users\\56kyl\\source\\repos\\cookiecutter-robust-python",
   "add_rust_extension": true,
   "author": "Kyle Oliver",

.cruft.json

@@ -1,6 +1,6 @@
 {
   "template": "C:\\Users\\56kyl\\source\\repos\\cookiecutter-robust-python",
-  "commit": "38dcdc32c1ae8d68c230140b81036716e8d3f0b6",
+  "commit": "5d756a871ab41b11e3501fbd7b59297c92371b66",
   "checkout": null,
   "context": {
     "cookiecutter": {
@@ -20,7 +20,7 @@
       "license": "MIT",
       "development_status": "Development Status :: 1 - Planning",
       "_template": "C:\\Users\\56kyl\\source\\repos\\cookiecutter-robust-python",
-      "_commit": "38dcdc32c1ae8d68c230140b81036716e8d3f0b6"
+      "_commit": "5d756a871ab41b11e3501fbd7b59297c92371b66"
     }
   },
   "directory": null

rust/Cargo.lock

@@ -0,0 +1,12 @@
+[package]
+name = "robust-maturin-demo"
+version = "0.0.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+name = "robust_maturin_demo"
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = "0.22.0"

rust/Cargo.toml

@@ -0,0 +1,14 @@
+use pyo3::prelude::*;
+
+/// Formats the sum of two numbers as string.
+#[pyfunction]
+fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
+    Ok((a + b).to_string())
+}
+
+/// A Python module implemented in Rust.
+#[pymodule]
+fn robust_maturin_demo(m: &Bound<'_, PyModule>) -> PyResult<()> {
+    m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
+    Ok(())
+}