dev(hansbug): fix get and pop method

[HansBug]

#44

[codecov]

Codecov Report

Merging #49 (964edea) into main (bfbd23d) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   99.24%   99.24%   -0.01%     
==========================================
  Files          35       35              
  Lines        2125     2122       -3     
==========================================
- Hits         2109     2106       -3     
  Misses         16       16              

Flag	Coverage Δ
unittests	99.24% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
treevalue/tree/tree/tree.pyx	100.00% <100.00%> (ø)

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