Improve Code Quality

[siqirua]

No description provided.

[codecov]

Codecov Report

Merging #178 (7d612ca) into master (829bbaa) will increase coverage by 0.11%.
Report is 6 commits behind head on master.
The diff coverage is 59.37%.

@@             Coverage Diff              @@
##             master     #178      +/-   ##
============================================
+ Coverage     57.20%   57.31%   +0.11%     
- Complexity      710      718       +8     
============================================
  Files           126      126              
  Lines          3246     3238       -8     
  Branches        378      375       -3     
============================================
- Hits           1857     1856       -1     
+ Misses         1209     1203       -6     
+ Partials        180      179       -1     

Files	Coverage Δ
...ight/logic/commands/DeleteStudentScoreCommand.java	0.00% <ø> (ø)
...u/modulight/logic/commands/FindStudentCommand.java	100.00% <100.00%> (ø)
...seedu/modulight/logic/commands/ListAllCommand.java	0.00% <ø> (ø)
...u/modulight/logic/commands/SortStudentCommand.java	68.18% <ø> (ø)
...ulight/logic/commands/SortStudentScoreCommand.java	70.00% <ø> (ø)
.../logic/parser/AddGradedComponentCommandParser.java	0.00% <ø> (ø)
...odulight/logic/parser/AddStudentCommandParser.java	95.23% <100.00%> (-0.22%)	⬇️
...logic/parser/EditGradedComponentCommandParser.java	0.00% <ø> (ø)
...dulight/logic/parser/EditStudentCommandParser.java	85.29% <ø> (ø)
...ht/logic/parser/EditStudentScoreCommandParser.java	80.00% <ø> (ø)
... and 9 more