Removed the added .txt at the end of the fileName
removed all .txt and trimmed all add and delete keywords
Changed to save per op, command for each new command line
colon after file ready
changed all [0] to a CONSTANT, INDEX_ZERO
changed WELCOME GREETING TO CONSTANT STRING
Changed greeting message to CONSTANT STRING
CHANGED splitter[1] to splitter[INPUT_CONTENT]
switch case can now handle invalid command
No more magic numbers.