PE-D review bug fixes

[Cedo8]

Fix success message bugs
Fix edit bug
Fix bug where adding patients with same medical record url works
Update email format
Fix and update test cases

[codecov-io]

Codecov Report

Merging #226 into master will decrease coverage by 0.13%.
The diff coverage is 58.33%.

@@             Coverage Diff              @@
##             master     #226      +/-   ##
============================================
- Coverage     58.06%   57.93%   -0.14%     
- Complexity      479      484       +5     
============================================
  Files            91       91              
  Lines          1860     1878      +18     
  Branches        204      211       +7     
============================================
+ Hits           1080     1088       +8     
- Misses          723      729       +6     
- Partials         57       61       +4     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...java/seedu/address/logic/commands/ListCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...c/main/java/seedu/address/model/patient/Email.java	80.00% <ø> (ø)	6.00 <0.00> (ø)
.../java/seedu/address/logic/commands/AddCommand.java	87.50% <33.33%> (-12.50%)	9.00 <0.00> (ø)
src/main/java/seedu/address/model/HospifyBook.java	79.48% <33.33%> (-14.46%)	17.00 <1.00> (ø)
...java/seedu/address/logic/commands/EditCommand.java	93.47% <55.55%> (-1.82%)	16.00 <2.00> (+3.00)	⬇️
...ava/seedu/address/logic/commands/CountCommand.java	100.00% <100.00%> (ø)	2.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	100.00% <100.00%> (ø)	27.00 <1.00> (+1.00)
...ava/seedu/address/model/patient/MedicalRecord.java	80.00% <100.00%> (ø)	6.00 <1.00> (ø)
... and 2 more

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