ac-6 : week-5 : enable button, optimize code

[rush1kesh-010]

Issue that this pull request solves

Enables the button directing to Department module
Optimizes redundant code

Brief description of what is fixed or changed

The button on dashboard is enabled which directs to Department module
Data of all students is shown efficiently

Types of changes

Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

Put an x in the boxes that apply

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have created new branch for this pull request
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• My changes does not break the current system and it passes all the current test cases.

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