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The encrypt/decrypt algorithm must correctly handle the ends of the alphabet. When a character less than 'a' is needed, the algorithm must wrap to 'z' and then continue backwards from there. When a...

You should be able to look at the ciphered text, egiwsr, the resulting decrypted text, abcpki, (which should be abczwi) and then inspect your code to determine why the resulting decryption is...

It's interesting that the incorrect decryption results vary from the encrypted input in a simple way. For example:

Encrypted: pfsi
Decrypted: pgul

Can you see that

p + 0 = p
f + 1 = g
s...