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orion.a.smith@gmail.com apcsa-encryption > apcsaDecryptRailFence
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(HARD) Given an ciphertext String and a number of rails, decode it using a rail fence cipher and return the plaintext. 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 again.  (I think) this is harder than the encode.

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






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