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orion.a.smith@gmail.com apcsa-encryption > apcsaEncryptRailFence
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(HARD) Given an input String and a number of rails, encode it using a rail fence cipher and return the ciphertext. The rail fence cipher is described here: 


https://en.wikipedia.org/wiki/Rail_fence_cipher


Precondition: at least two rails.

HINT

You will need to think two-dimensionally...

apcsaEncryptRailFence("WEAREDISCOVERED", 3) → "WECRERDSOEEAIVD"
apcsaEncryptRailFence("helphelpimbeingrepressed", 3) → "hhiiesepepmenrpesdllbgre"
apcsaEncryptRailFence("0123456789", 5) → "0817926354"
...Save, Compile, Run (ctrl-enter)
public String apcsaEncryptRailFence(String plaintext, int numRails) {
  
}






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