completed assignment

force-app/main/default/triggers/UpdateCase.trigger

@@ -0,0 +1,25 @@
+trigger UpdateCase on CaseComment (before insert) {
+    Map<String, String> keywordToStatus = new Map<String, String> {
+        'resolved' => 'Closed',
+        'fixed' => 'Closed',
+        'completed' => 'Closed',
+        'reopen' => 'Reopened',
+        'reopened' => 'Reopened'
+    };
+
+    for (CaseComment comment : Trigger.New) {
+        Case theCase = [
+            SELECT Id, Status 
+            FROM Case 
+            WHERE Id = :comment.ParentId
+        ];
+
+        for (String keyword : keywordToStatus.keySet()) {
+            if (comment.CommentBody.toLowerCase().contains(keyword.toLowerCase())) {
+                theCase.Status = keywordToStatus.get(keyword);
+                update theCase;
+                break;
+            }
+        }
+    }
+}