Added trace operation + test and renamed base2k to backend

backend/build.rs

@@ -0,0 +1,13 @@
+use std::path::absolute;
+
+fn main() {
+    println!(
+        "cargo:rustc-link-search=native={}",
+        absolute("spqlios-arithmetic/build/spqlios")
+            .unwrap()
+            .to_str()
+            .unwrap()
+    );
+    println!("cargo:rustc-link-lib=static=spqlios");
+    // println!("cargo:rustc-link-lib=dylib=spqlios")
+}