Bug 400

Recommend command array out of bounds.

When there are less than 2 events that are the same major or less than 2 events are not the same major with the target recommend student, it will have an error of array out of bounds.

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Welcome to the Event Management System
Please input today date (e.g. 01-jan-2020).
13-oct-2020
SystemDate confirm: 13-Oct-2020
Please enter your command: 
create event badminton e12345678 10 20-oct-2020 cs 5 2 3
Created badminton event with EventID: e12345678.
Please enter your command: 
create student s12345678 cs mary chan F 19
Created student mary chan with StudentID: s12345678.
Please enter your command: 
recommend s12345678
Here are the recommended events from your department: 

|Event ID  |Event Name               |Date        |Capacity|Major                         |Quota|Type      |Group Capacity |Group Quota|Min No. In Group|Max No. In Group|
|e12345678 |badminton                     |20-Oct-2020 |10      |Computer Science              |10   |Group     |5              |5          |2               |3               |
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at EventManagementSystem.CmdRecommend.execute(CmdRecommend.java:57)
	at EventManagementSystem.Main.main(Main.java:128)
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