Implement Btree

[oinume]

No description provided.

[codecov-io]

Codecov Report

Merging #32 into master will decrease coverage by 0.91%.
The diff coverage is 74.74%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   79.77%   78.86%   -0.92%     
==========================================
  Files           8       10       +2     
  Lines         445      544      +99     
==========================================
+ Hits          355      429      +74     
- Misses         61       80      +19     
- Partials       29       35       +6

Impacted Files	Coverage Δ
datastructure/linked_list/linked_list.go	81.7% <ø> (ø)	⬆️
datastructure/btree/node.go	72.72% <72.72%> (ø)
datastructure/btree/tree.go	81.81% <81.81%> (ø)

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