Fix double-save issue

[dr-orlovsky]

Closes #78

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 4.9%. Comparing base (429c853) to head (2e58208).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/wallet.rs	0.0%	3 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master    #79   +/-   ##
=====================================
  Coverage     4.9%   4.9%           
=====================================
  Files          24     24           
  Lines        2315   2315           
=====================================
  Hits          113    113           
  Misses       2202   2202           

Flag	Coverage Δ
rust	4.9% <0.0%> (ø)

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