~/workspace/hacker2 $ check50 2015.fall.pset2.vigenere vigenere.c
:) vigenere.c exists
:) vigenere.c compiles
:( encrypts "a" as "a" using "a" as keyword
   \ expected output, but not "a øÿ\n"
:( encrypts "world, say hello!" as "xoqmd, rby gflkp!" using "baz" as keyword
   \ expected output, but not "xoqmd, rby gflkp!@Aÿ\n"
:) encrypts "BaRFoo" as "CaQGon" using "BaZ" as keyword
:) encrypts "BARFOO" as "CAQGON" using "BAZ" as keyword
:) handles lack of argv[1]
:) handles argc > 2
:) rejects "Hax0r2" as keyword
https://sandbox.cs50.net/checks/dcc4a6187d8d414d96d9b33c2adecbb5

~/workspace/hacker2 $ ./vigenere a
a
a~/workspace/hacker2 $ ./vigenere a
a
a`hd