Updated math lib and import in cargo toml file

src/main.rs

@@ -0,0 +1,6 @@
+use math;
+
+fn main() {
+    let sum = math::sum(1, 2);
+    println!("Sum number {}", sum)
+}

src/utils.rs

@@ -1,3 +1,4 @@
+#[allow(dead_code)]
 pub fn set_panic_hook() {
     // When the `console_error_panic_hook` feature is enabled, we can call the
     // `set_panic_hook` function at least once during initialization, and then
@@ -7,4 +8,4 @@ pub fn set_panic_hook() {
     // https://github.com/rustwasm/console_error_panic_hook#readme
     #[cfg(feature = "console_error_panic_hook")]
     console_error_panic_hook::set_once();
-}
+}