Caeser Cipher Function using unsigned char?

Caeser Cipher Function using unsigned char?

References

Reference NO 1

http://stackoverflow.com/questions/15189991/caeser-cipher-function-using-unsigned-char

Reference NO 2

http://www.cplusplus.com/articles/9hvU7k9E/

Reference NO 3

http://cboard.cprogramming.com/c-programming/126895-caesar-cipher-bug-headaches.html

Reference NO 4

http://www.dreamincode.net/forums/topic/130390-solved-c-caesar-cipher-and-modulus/

Reference NO 5

http://competitions.cr.yp.to/caesar-call-1.html

Reference NO 6

http://rosettacode.org/wiki/Caesar_cipher

Reference NO 7

http://bytes.com/topic/c/answers/215426-why-does-work-rot13-function

Reference NO 8

http://dystopiancode.blogspot.com/2012/02/caesar-cipher-algorithms-in-c.html