Reverse polish notation initial

[yuryver]

Your job is to create a calculator which evaluates expressions in Reverse Polish notation.

For example expression 5 1 2 + 4 * + 3 - (which is equivalent to 5 + ((1 + 2) * 4) - 3 in normal notation) should evaluate to 14.

Note that for simplicity you may assume that there are always spaces between numbers and operations, e.g. 1 3 + expression is valid, but 1 3+ isn't.

Empty expression should evaluate to 0.

Valid operations are +, -, *, /.

You may assume that there won't be exceptional situations (like stack underflow or division by zero).

[codecov-io]

Codecov Report

Merging #103 into develop will decrease coverage by 0.39%.
The diff coverage is 92.68%.

@@             Coverage Diff              @@
##             develop     #103     +/-   ##
============================================
- Coverage      86.26%   85.87%   -0.4%     
- Complexity       355      411     +56     
============================================
  Files             84       93      +9     
  Lines            852      977    +125     
  Branches         140      165     +25     
============================================
+ Hits             735      839    +104     
- Misses           105      122     +17     
- Partials          12       16      +4

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/org/fundacionjala/coding/yury/Calc.java	92.68% <92.68%> (ø)	25 <25> (?)
...ltiplesofthreeandfive/MultiplesOfThreeAndFive.java	66.66% <0%> (ø)	4% <0%> (?)
...ionjala/coding/marcoslara/spinwords/SpinWords.java	71.42% <0%> (ø)	3% <0%> (?)
.../coding/marcoslara/eanvalidation/EanValidator.java	66.66% <0%> (ø)	4% <0%> (?)
...arcoslara/averagesofnumbers/AveragesOfNumbers.java	75% <0%> (ø)	4% <0%> (?)
...g/marcoslara/evalulationevaporator/Evaporator.java	75% <0%> (ø)	2% <0%> (?)
.../marcoslara/highestandlowest/HighestAndLowest.java	50% <0%> (ø)	1% <0%> (?)
...ndacionjala/coding/marcoslara/bankocr/BankOCR.java	90% <0%> (ø)	9% <0%> (?)
.../marcoslara/sortinnercontent/SortInnerContent.java	83.33% <0%> (ø)	4% <0%> (?)

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