diff --git a/index.js b/index.js
index ade04b8..8a5dbb5 100644
--- a/index.js
+++ b/index.js
@@ -1,14 +1,21 @@
 import { dlopen, FFIType, suffix } from "bun:ffi";
 
-const path = `./libfibonacci.so`;
+const path = `./libtesticolo.so`;
 
 const { symbols } = dlopen(path, {
-  fibonacci_gmp: {
-    args: [],
-    returns: FFIType.cstring,
+  testicolo: {
+    args: [FFIType.cstring, FFIType.cstring],
+    returns: FFIType.void,
   },
 });
 
-const result = symbols.fibonacci_gmp();
-console.log("Fibonacci(25000) =", result);
+const input = "qwertyuiopasdfghjkllzxcvbnm123456789mnbvcxzlkjhgfdsapoiuytrewq1234567890";
+const output = new ArrayBuffer(input.length + 1);
+const outputView = new Uint8Array(output);
 
+// Call the function with the input string
+symbols.testicolo(input, outputView);
+
+// Convert the output buffer to a string and log it
+const result = new TextDecoder().decode(outputView);
+console.log(result);