feat: overdraft function

[ascandone]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 62.68%. Comparing base (ce58d0f) to head (f62e3db).

Files with missing lines	Patch %	Lines
internal/interpreter/interpreter.go	66.66%	9 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #14      +/-   ##
==========================================
+ Coverage   62.65%   62.68%   +0.02%     
==========================================
  Files          28       28              
  Lines        6041     6078      +37     
==========================================
+ Hits         3785     3810      +25     
- Misses       2096     2104       +8     
- Partials      160      164       +4     

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[ascandone]

It turns out I couldn't call this function overdraft because that is already a token.
So we would need to use something like overdraft_amount instead (or workaround this issue, which I'm not sure is a good idea)