chore: fix formatting and clippy lints

server/tests/image_test.rs

@@ -0,0 +1,7 @@
+use image::DynamicImage;
+#[test]
+fn test_img() {
+    let mut img = image::DynamicImage::new_rgb8(10, 10);
+    img.invert();
+    let img2 = img.adjust_contrast(20.0);
+}