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This is a simple solution for roman numeral kata, I struggled before for it with subtract issues and it was so complex but this style is a piece of cake, try it.
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README.markdown
roman_numeral.rb
roman_numeral_spec.rb

README.markdown

This is a simple roman numeral kata and below is some basic guidelines for these numbers

Main Numbers in Roman:

I = 1 V = 5 X = 10 L = 50 C = 100 D = 500 M = 1000

add style sample: 110 => 100 + 10 => CX

subtract style sample: 90 => 100 - 10 => XC

4999 => 4000 + 900 + 90 + 9 => MMMM + CM + XC + IX => MMMMCMXCIX

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