Add two DeviceID helper functions so the prefix:id are always uniform…

[schmidtw]

…ly split when that is needed.

[codecov]

Codecov Report

Merging #137 (9de4923) into main (4336a45) will increase coverage by 0.14%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
+ Coverage   47.55%   47.69%   +0.14%     
==========================================
  Files          24       24              
  Lines        4332     4344      +12     
==========================================
+ Hits         2060     2072      +12     
  Misses       2087     2087              
  Partials      185      185              

Flag	Coverage Δ
unittests	47.69% <100.00%> (+0.14%)	⬆️

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

Files Changed	Coverage Δ
id.go	100.00% <100.00%> (ø)