Refactor code

[shaunlxw]

Changes:

• Index: removed dead code
• DeleteCommandTest: fix naming of methods and add test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.54%. Comparing base (8f6f617) to head (2a0bbec).

❗ Current head 2a0bbec differs from pull request most recent head 9f06f44. Consider uploading reports for the commit 9f06f44 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #108      +/-   ##
============================================
+ Coverage     77.47%   77.54%   +0.07%     
+ Complexity      868      734     -134     
============================================
  Files           107       99       -8     
  Lines          2726     2365     -361     
  Branches        338      280      -58     
============================================
- Hits           2112     1834     -278     
+ Misses          509      445      -64     
+ Partials        105       86      -19     

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[purivirakarin]

LGTM! thanks for updating the code to follow the implementation of using ID instead of index.