Updated the decryption

[UdayRajVadeghar]

Since the transposition decryption is changing the value of n , the decryption back to the original name wasn't possible earlier. Fixed one of the two bugs. I will look through the encryption bug in a few hours, hope you merge this meanwhile.

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[vil02]

@UdayRajVadeghar could you cleanup the existing implementation first? That would requite adding tests and making this class testable.

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