remove some unnecessary imports and call them inline

src/sprite.rs

@@ -1,4 +1,4 @@
-use crate::{AnimationFrames, Image, Position, mock, from_base36, ToBase36, optional_data_line};
+use crate::{AnimationFrames, Image, Position, from_base36, ToBase36, optional_data_line};
 
 #[derive(Debug, Eq, PartialEq)]
 pub struct Sprite {
@@ -101,12 +101,15 @@ fn test_sprite_from_string() {
         include_str!("test-resources/sprite").to_string()
     );
 
-    let expected = mock::sprite();
+    let expected = crate::mock::sprite();
 
     assert_eq!(output, expected);
 }
 
 #[test]
 fn test_sprite_to_string() {
-    assert_eq!(mock::sprite().to_string(), include_str!("test-resources/sprite").to_string());
+    assert_eq!(
+        crate::mock::sprite().to_string(),
+        include_str!("test-resources/sprite").to_string()
+    );
 }