Fix bug

[Rishit02]

Bug fixes:

• Cannot add same names regardless of their case. (As mentioned in UG)
• Removed date parsing features
• Widening the scope of a message (or making it more general) is done
• Fix [PE-D][Tester E] Documentation: No suggestion of date command #178
• Close [PE-D][Tester C] Unable to use the schedule command due to date formatting #175
• Close [PE-D][Tester E] Documentation: Command summary not updated #174
• Close [PE-D][Tester B] Command summary does not display all commands #150
• Close [PE-D][Tester E] Improper handling of error message for adding event #149
• Close [PE-D][Tester E] Duplicate names are not allowed #117
• Close [PE-D][Tester B] Add command allows multiple users with the same name to be added, if they have different cases #167

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.7908%. Comparing base (5809c08) to head (d4319a4).
Report is 5 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master       #203        +/-   ##
==================================================
- Coverage     93.8676%   93.7908%   -0.0769%     
+ Complexity        714        713         -1     
==================================================
  Files              96         96                
  Lines            1859       1836        -23     
  Branches          184        183         -1     
==================================================
- Hits             1745       1722        -23     
  Misses             65         65                
  Partials           49         49                

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[Jolonauh]

LGTM