Migrate to hashbrown structures

src/repetitions.rs

@@ -97,9 +97,7 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
                         .iter()
                         .map(|c| self.word_id_index_map[&c.word_id])
                         .collect();
-                    println!("Already exists {:?}", added);
                     let total = set.get_word_list(&state);
-                    println!("Available{:?}", total);
 
                     self.current_sets_cards_cache.insert(index, (added, total));
 
@@ -164,14 +162,6 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
                         .cloned()
                         .collect();
 
-                    for x in &cache.0 {
-                        println!("Already exists {:?}", state.dictionary.get(*x).unwrap());
-                    }
-
-                    for w in &adding {
-                        println!("{:?}", state.dictionary.get(*w).unwrap());
-                    }
-
                     let mut new_current = cache.0.clone();
                     new_current.append(&mut adding.clone());
                     total_cache.insert(index, (new_current, cache.1.clone()));