Simple refactor

[glennmoy]

drive-by refactoring of some code

[codecov]

Codecov Report

Merging #41 (362ff3e) into main (7aef385) will decrease coverage by 0.71%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   95.31%   94.59%   -0.72%     
==========================================
  Files           9        9              
  Lines         128      111      -17     
==========================================
- Hits          122      105      -17     
  Misses          6        6              

Impacted Files	Coverage Δ
src/power.jl	100.00% <100.00%> (ø)
src/transformers.jl	100.00% <100.00%> (ø)
src/scaling.jl	96.15% <0.00%> (-0.52%)	⬇️
src/periodic.jl	100.00% <0.00%> (ø)
src/one_hot_encoding.jl	100.00% <0.00%> (ø)
src/linear_combination.jl	100.00% <0.00%> (ø)

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