moved getting shelf to universal function instead of whatever I was doing befoer

src/utils.rs

@@ -43,6 +43,17 @@ pub fn save_library(library: Library) -> io::Result<()> {
     Ok(())
 }
 
+pub fn get_current_shelf(library: &mut Library) -> &mut Shelf {
+    // Rust variable nonsense (get current shelf index)
+    let shelves = &library.shelves;
+    let current_shelf = &library.current_shelf;
+    let shelf_index = get_shelf_index(shelves, current_shelf).unwrap_or(0);
+
+    // Get current shelf index and push the file
+    let current_shelf = &mut library.shelves[*&shelf_index];
+    return current_shelf;
+}
+
 pub fn initialize_library() -> Library {
     let default_shelf: Shelf = Shelf {
         id: 0,