fix: Transfer excess back and reset allowance

[miguelmtzinf]

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[height]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.52%. Comparing base (803c3e7) to head (5e0227b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #193      +/-   ##
==========================================
+ Coverage   56.16%   56.52%   +0.35%     
==========================================
  Files          26       26              
  Lines         981      989       +8     
  Branches      125      127       +2     
==========================================
+ Hits          551      559       +8     
  Misses        430      430              

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