Fix typos in benchmarking code

Author: smu160

benches/Makefile

@@ -2,9 +2,9 @@ CC = gcc
 CFLAGS = -Wall -Wextra -O3 -march=native
 LIBS = -lfftw3 -lm
 
-program: main.c
+bench_fftw: main.c
 	$(CC) $(CFLAGS) -o bench_fftw main.c $(LIBS)
 
 clean:
-	rm -f program
+	rm -f bench_fftw
 

examples/benchmark.rs

@@ -10,10 +10,10 @@ fn benchmark_fft(n: usize) {
     let mut imags = vec![0.0; big_n];
     gen_random_signal(&mut reals, &mut imags);
 
-    // let now = std::time::Instant::now();
+    let now = std::time::Instant::now();
     fft_dif(&mut reals, &mut imags);
-    // let elapsed = now.elapsed().as_micros();
-    // println!("{elapsed}");
+    let elapsed = now.elapsed().as_micros();
+    println!("{elapsed}");
 }
 
 fn main() {