added new functionality to only enter unique values in the arrays
corrected error on prompter to enter value inside the if, taken out of the if but still in thw while. Also changed method name to match requirement
added method to compare arrays and return an array of common values. Changed the printing and methods for it so that a third array can be printed without printing the name of the array, as before.
added method to return non common values but does not work, not sure why it reaches outside the array. I can work arround this though.
aal done