Various code quality fixes

[junweimoo]

No description provided.

[codecov-commenter]

Codecov Report

Base: 65.19% // Head: 65.25% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (68802af) compared to base (570572e).
Patch coverage: 70.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #331      +/-   ##
============================================
+ Coverage     65.19%   65.25%   +0.05%     
- Complexity      680      682       +2     
============================================
  Files           112      112              
  Lines          2270     2271       +1     
  Branches        253      253              
============================================
+ Hits           1480     1482       +2     
+ Misses          693      692       -1     
  Partials         97       97              

Impacted Files	Coverage Δ
...edu/address/logic/commands/EditMeetingCommand.java	0.00% <0.00%> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	98.14% <ø> (-0.04%)	⬇️
...main/java/seedu/address/model/client/Birthday.java	21.87% <0.00%> (ø)
...c/main/java/seedu/address/model/client/Client.java	84.84% <0.00%> (ø)
src/main/java/seedu/address/model/MyInsuRec.java	84.05% <100.00%> (+0.72%)	⬆️
.../main/java/seedu/address/model/client/Address.java	72.72% <100.00%> (ø)
...rc/main/java/seedu/address/model/client/Email.java	72.72% <100.00%> (ø)
.../java/seedu/address/storage/JsonAdaptedClient.java	82.27% <100.00%> (ø)

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