Refactoring and add unit tests

[kotarot]

No description provided.

[codecov]

Codecov Report

Merging #22 (1b46c35) into main (e6caabc) will increase coverage by 6.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   85.76%   92.13%   +6.36%     
==========================================
  Files           8        8              
  Lines         267      267              
==========================================
+ Hits          229      246      +17     
+ Misses         38       21      -17     

Flag	Coverage Δ
unittests	92.13% <ø> (+6.36%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rectangle_packing_solver/sequence_pair.py	81.91% <0.00%> (+1.06%)	⬆️
rectangle_packing_solver/problem.py	100.00% <0.00%> (+21.05%)	⬆️
rectangle_packing_solver/solution.py	100.00% <0.00%> (+40.00%)	⬆️
rectangle_packing_solver/floorplan.py	100.00% <0.00%> (+42.85%)	⬆️

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