Add function stubs as sketched in interface description

[phipsgabler]

No description provided.

[yebai]

Looks good - thanks @phipsgabler!

[codecov]

Codecov Report

Merging #20 (f1792c0) into main (f64b0a9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   82.45%   82.45%           
=======================================
  Files           1        1           
  Lines          57       57           
=======================================
  Hits           47       47           
  Misses         10       10           

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[coveralls]

Pull Request Test Coverage Report for Build 846787731

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 82.456%

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Totals
Change from base Build 839689895:	0.0%
Covered Lines:	47
Relevant Lines:	57

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💛 - Coveralls