Clippy code cleanup

src/data_provider/card_stats.rs

@@ -27,16 +27,16 @@ pub fn load_stats_of_set(set: &CardSetSettings, connection: &Connection) -> Vec<
     buffer
 }
 
-pub fn add_stat_list(stat: &mut Vec<CardStatistics>, connection: &Connection) {
+pub fn add_stat_list(stat: &mut [CardStatistics], connection: &Connection) {
     let inserting = stat
         .iter()
         .map(|stat| {
             format!(
                 "({}, {}, {}, {})",
-                stat.word_id.to_string(),
-                stat.set_id.to_string(),
-                stat.score.to_string(),
-                stat.last_open.timestamp().to_string()
+                stat.word_id,
+                stat.set_id,
+                stat.score,
+                stat.last_open.timestamp()
             )
         })
         .collect::<Vec<_>>()
@@ -48,7 +48,6 @@ pub fn add_stat_list(stat: &mut Vec<CardStatistics>, connection: &Connection) {
     let count = connection.execute(query.as_str(), ());
 
     if count.is_err() {
-        println!("{}", count.unwrap_err());
         return;
     }
 
@@ -60,12 +59,10 @@ pub fn add_stat_list(stat: &mut Vec<CardStatistics>, connection: &Connection) {
         )
         .unwrap();
 
-    let start_index = last_index - (count.unwrap() as u32) + 1;
+    let start_index = last_index - (stat.len() as u32) + 1;
 
-    let mut index = 0;
-    for id in start_index..=last_index {
+    for (index, id) in (start_index..=last_index).enumerate() {
         stat[index].id = id;
-        index += 1;
     }
 }