Refactor function signatures to use slices

src/utils/tester.rs

@@ -133,7 +133,7 @@ pub fn run_benchmarks(update: bool, filter: Option<&str>) -> Vec<BenchmarkResult
                 let mut total = Duration::ZERO;
                 for _ in 0..n {
                     let start = Instant::now();
-                    let _ = (func.func)(vec![]);
+                    let _ = (func.func)(&[]);
                     total += start.elapsed();
                 }
                 Ok(total)