Implement Rail Fence Cipher#3
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Tests pass.
RegEx might need a fix :
rail-5-3-is recognized as a valid codec (ending dash is too much). Onlyrail-5-3orrail-5-3-upshould be recognized. Couldn't manage to get that right.When encoding, there might be trailing whitespaces (which is normal), but users might forget one when copy/pasting. I left them invisible to ease the integration with other tools.