Edit DG and UML

[yyutong]

No description provided.

[codecov-io]

Codecov Report

Merging #130 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #130   +/-   ##
=========================================
  Coverage     41.38%   41.38%           
  Complexity      266      266           
=========================================
  Files            81       81           
  Lines          1358     1358           
  Branches        118      118           
=========================================
  Hits            562      562           
  Misses          736      736           
  Partials         60       60           

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[tanwayne890]

Do you create the expenseClassDiagram?

[yyutong]

Do you create the expenseClassDiagram?
Yes I created it in my last pull request if I didn't remember wrongly!