Fix checkstyle errors

docs/team/jylow.md

@@ -23,12 +23,12 @@ Given below are my contributions to the project.
   * Justification: Most people only arrange one appointment at a time. So the design prevents multiple appointments and also serves as a reminder of a previously set appointment.
   * Highlights: This feature causes the logic flow of the method to change if there is currently an appointment and results in breaking the execution into 2, getting a response from the user before deciding whether to continue the execution of the program.
   * Credits: The feature was implemented by referencing the help function from AB3. However, the main logic of the function was done by myself.
- 
+
 * **Code Contributed**: [RepoSense](https://nus-cs2103-ay2324s1.github.io/tp-dashboard/?search=jylow&breakdown=true)
 
-* **Enhancements Implemented**: 
+* **Enhancements Implemented**:
     * Fixed bugs identified during manual testing.
-  
+
 * **Contributions to the UG**:
     * Added documentation for the feature `sort`. [\#81](https://github.com/AY2324S1-CS2103T-F12-1/tp/pull/81)
     * Maintained known issues to be solved.
@@ -44,5 +44,5 @@ Given below are my contributions to the project.
   * Contributed to 1 forum discussion. (examples: [1](https://github.com/nus-cs2103-AY2324S1/forum/issues/172#issuecomment-1730790631))
   * Reported bugs and suggestions for other teams in the class during PED.
 
-* **Contributions to team-based tasks**: 
+* **Contributions to team-based tasks**:
   * Released v1.3 and v1.4 of the application.

src/main/java/seedu/address/logic/parser/GatherCommandParser.java

@@ -36,7 +36,7 @@ public GatherCommand parse(String args) throws ParseException {
         if (argMultimap.getValue(PREFIX_FINANCIAL_PLAN).isPresent()) {
             return createGatherByFinancialPlan(trimmedArgs);
         }
-        
+
         if (argMultimap.getValue(PREFIX_TAG).isPresent()) {
             return createGatherByTag(trimmedArgs);
         }

src/test/java/seedu/address/model/financialplan/FinancialPlanTest.java

@@ -49,5 +49,6 @@ public void equals() {
         assertTrue(fp1.equals(fp1));
         assertTrue(fp1.equals(fp2));
         assertFalse(fp1.equals(fp3));
+        assertFalse(fp2.equals(null));
     }
 }