Adapt c-hash-sig for kagome-crates integration

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "pq-bindings-c-rust"
+name = "c_hash_sig_crust"
 version = "0.1.0"
 edition = "2021"
 
@@ -12,5 +12,4 @@ rand = "0.9"
 bincode = { version = "2.0.1", features = ["serde"] }
 
 [build-dependencies]
-cbindgen = "0.27"
-
+build-helper = { path = "../build-helper" }

build.rs

@@ -1,29 +1,5 @@
-extern crate cbindgen;
-
-use std::env;
-use std::fs;
-use std::path::PathBuf;
 
 fn main() {
-    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
-    let package_name = env::var("CARGO_PKG_NAME").unwrap();
-
-    // Create include directory in project root
-    let include_dir = PathBuf::from(&crate_dir).join("include");
-    fs::create_dir_all(&include_dir).expect("Unable to create include directory");
-
-    let output_file = include_dir
-        .join(format!("{}.h", package_name))
-        .display()
-        .to_string();
-
-    cbindgen::Builder::new()
-        .with_crate(crate_dir)
-        .with_language(cbindgen::Language::C)
-        .generate()
-        .expect("Unable to generate bindings")
-        .write_to_file(&output_file);
-
-    println!("cargo:rerun-if-changed=src/lib.rs");
+    build_helper::run_cbindgen();
 }