rm getparent annotations

[guimarqu]

fix #110

[codecov-io]

Codecov Report

Merging #171 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #171     +/-   ##
=========================================
+ Coverage   76.77%   76.87%   +0.1%     
=========================================
  Files          38       38             
  Lines        2174     2171      -3     
=========================================
  Hits         1669     1669             
+ Misses        505      502      -3

Impacted Files	Coverage Δ
src/problem.jl	93.47% <ø> (+5.72%)	⬆️

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