make a static lib

Cargo.toml

@@ -4,6 +4,12 @@ version = "0.1.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+crate-type = [
+  "staticlib", # Ensure it gets compiled as a (static) C library
+  # "cdylib",     # If you want a shared/dynamic C library (advanced)
+  "lib", # For downstream Rust dependents: `examples/`, `tests/` etc.
+]
 
 [dependencies]