Cleaner code, a little improvement in performance

[MaximeBouton]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 95

• 18 of 21 (85.71%) changed or added relevant lines in 2 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.7%) to 65.974%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/episode_replay.jl	0	1	0.0%
src/solver.jl	18	20	90.0%

Files with Coverage Reduction	New Missed Lines	%
src/dueling.jl	1	87.5%
src/solver.jl	3	63.85%

Totals
Change from base Build 83:	-0.7%
Covered Lines:	254
Relevant Lines:	385

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #7 into master will decrease coverage by 0.69%.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##           master       #7     +/-   ##
=========================================
- Coverage   66.66%   65.97%   -0.7%     
=========================================
  Files           9        9             
  Lines         396      385     -11     
=========================================
- Hits          264      254     -10     
+ Misses        132      131      -1

Impacted Files	Coverage Δ
src/episode_replay.jl	63.49% <0%> (ø)	⬆️
src/solver.jl	63.84% <90%> (-1.41%)	⬇️
src/dueling.jl	87.5% <0%> (-3.13%)	⬇️

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