feat: completed solutions

exercises/11_hashmaps/hashmaps3.rs

@@ -31,13 +31,47 @@ fn build_scores_table(results: &str) -> HashMap<&str, TeamScores> {
         // Keep in mind that goals scored by team 1 will be the number of goals
         // conceded by team 2. Similarly, goals scored by team 2 will be the
         // number of goals conceded by team 1.
-    }
+        scores
+            .entry(team_1_name)
+            .and_modify(|current_team_1_scores| {
+                current_team_1_scores.goals_scored += team_1_score;
+                current_team_1_scores.goals_conceded += team_2_score
+            })
+            .or_insert(TeamScores {
+                goals_scored: team_1_score,
+                goals_conceded: team_2_score,
+            });
 
+        scores
+            .entry(team_2_name)
+            .and_modify(|current_team_2_scores| {
+                current_team_2_scores.goals_scored += team_2_score;
+                current_team_2_scores.goals_conceded += team_1_score
+            })
+            .or_insert(TeamScores {
+                goals_scored: team_2_score,
+                goals_conceded: team_1_score,
+            });
+    }
     scores
 }
 
 fn main() {
     // You can optionally experiment here.
+    const RESULTS: &str = "England,France,4,2
+France,Italy,3,1
+Poland,Spain,2,0
+Germany,England,2,1
+England,Spain,1,0";
+
+    let scores = build_scores_table(RESULTS);
+
+    for (key, value) in &scores {
+        println!(
+            "{key}: (scored: {0}, conceeded: {1})",
+            value.goals_scored, value.goals_conceded
+        );
+    }
 }
 
 #[cfg(test)]
@@ -54,9 +88,11 @@ England,Spain,1,0";
     fn build_scores() {
         let scores = build_scores_table(RESULTS);
 
-        assert!(["England", "France", "Germany", "Italy", "Poland", "Spain"]
-            .into_iter()
-            .all(|team_name| scores.contains_key(team_name)));
+        assert!(
+            ["England", "France", "Germany", "Italy", "Poland", "Spain"]
+                .into_iter()
+                .all(|team_name| scores.contains_key(team_name))
+        );
     }
 
     #[test]