fix: improve comments

src/main/java/BonusExercises.java

@@ -7,6 +7,17 @@ public class BonusExercises {
 
     /*
         complete the method below, so it will validate an email address
+        1. Must have exactly one @ (no more, no less)
+        2. Split into local-part and domain (before @ and after @)
+        3. Local-part rules:
+            - Can't be empty
+            - Can't start or end with dot
+            - Can't have two dots in a row
+        4. Domain rules:
+            - Can't be empty
+            - Can't start or end with hyphen
+            - Can't have underscores
+            - Each segment (between dots) must follow same hyphen rules
      */
     public boolean validateEmail(String email) {
         String regex = ""; // todo
@@ -17,10 +28,16 @@ public class BonusExercises {
     }
 
     /*
-        this method should find a date in string
-        note that it should be in british or american format
-        if there's no match for a date, return null
-     */
+        This method should find and return the first date in a string.
+
+        Supported formats:
+        - American:   MM/DD/YYYY   (e.g., 12/09/2023)
+        - British:    DD/MM/YYYY   (e.g., 12/09/2023 — same pattern, context matters)
+        - ISO:        YYYY-MM-DD   (e.g., 2024-07-15)
+        - Slash variant: YYYY/MM/DD (e.g., 2025/01/01)
+
+        If no match for a date is found in the string, return null.
+    */
     public String findDate(String string) {
         // todo
         return null;