Problem-Set Week 2

• Deciphering using a substitution cipher.

Requirements

• Key provided, possibly subtract the letter from the given key and rotate it several cycles..
• Letters must follow the capitalization style of the plain text
• Key must not use repeated characters

Must uses isalpha()..?

get_char
get_double


isalnum -> Is alphanumeric. 
ispunct -> strcase is also an issue when locating a substrin
random -> Generate a random pseudonumber for analyzing how the allocation
strcpy -> strcasecmp
timeh