Issues #221, #223 and a few more

[harshangrjn]

Fixed issues: #221 #223

[codecov]

Codecov Report

Merging #224 (a786f36) into master (c6da8b9) will increase coverage by 0.86%.
The diff coverage is 97.77%.

❗ Current head a786f36 differs from pull request most recent head e88744d. Consider uploading reports for the commit e88744d to get more accurate results

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
+ Coverage   87.24%   88.11%   +0.86%     
==========================================
  Files          16       16              
  Lines        2988     2969      -19     
==========================================
+ Hits         2607     2616       +9     
+ Misses        381      353      -28     

Impacted Files	Coverage Δ
src/Alpine.jl	100.00% <ø> (ø)
src/solver_options.jl	100.00% <ø> (ø)
src/nlexpr.jl	91.33% <93.75%> (-0.12%)	⬇️
src/heuristics.jl	100.00% <100.00%> (+26.92%)	⬆️
src/log.jl	91.80% <100.00%> (+1.63%)	⬆️
src/main_algorithm.jl	85.31% <100.00%> (+0.05%)	⬆️
src/operators.jl	86.78% <100.00%> (+0.89%)	⬆️
src/presolve.jl	85.09% <100.00%> (ø)
src/utility.jl	87.40% <100.00%> (-0.40%)	⬇️
src/variable_bounds.jl	87.67% <100.00%> (+5.58%)	⬆️
... and 4 more

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