Merge pull request #284 from yyihaoc/branch-Fix-Bugs-3

Fix bugs in UG and DG, add `find` sequence diagram in DG

docs/DeveloperGuide.md

@@ -203,8 +203,6 @@ The following sequence diagram shows how a mark operation goes through the `Logi
 
 </div>
 
-Similarly, how an undo operation goes through the `Model` component is shown below:
-
 ![MarkAttendanceSequenceDiagram-Model](images/MarkAttendanceSequenceDiagram-Model.png)
 
 The `unmark` command does the opposite with the similar flow between `Logic` and `Model` component.
@@ -214,6 +212,16 @@ The following activity diagram summarizes what happens when a user executes a ne
 
 <img src="images/CommitActivityDiagram.png" width="250" />
 
+### Find feature
+
+#### Implementation
+
+The `find` command relies on the various `Predicate` classes, each of which encapsulates specific criteria to determine whether a contact matches the search conditions. These `Predicate` classes enable flexible and modular search logic, allowing the `find` command to filter contacts based on attributes such as `Name`, `Telegram`, `Role`, `FavouriteStatus`.
+
+The following sequence diagram shows how a `find f/` command goes through both `Logic` component and interacts with `Model`
+
+![FindSequenceDiagram](images/FindSequenceDiagram.png)
+
 ### Switch Profile Feature
 
 The `switch` command allows users to manage separate profiles within the application, each storing independent data in an isolated session. This feature enables users to work on different datasets without interference, as if each profile represented a unique instance of the application.
@@ -312,7 +320,7 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli
 | `*`      | user          | set privacy levels for each contact's information                           | protect sensitive details                                               |
 | `*`      | user          | see a profile picture for each contact                                      | recall the person from the picture                                      |
 
- 
+
 
 ### Use cases