Question 1: Programming (10 marks)

Part A (4 marks)

Implement a function called duplicates_def that:

• Takes an array of C-Strings, called strings1

• Takes a second array of C-Strings, called strings2

• Produces a new array of C-strings that contains all strings that occur in both string1 and string2.

• Returns the arrays of C-strings that was produced (through either the return value of the function, or a separate parameter to the function)

For example, if strings1 is the array

and strings2 is the array

It will produce and return the following array of C-strings:

Implement this function using a defensive programming paradigm. That is, your function should account for all possible inputs.

Additionally in implementing your function:

• Choose suitable parameters for the function, so that your it can be fully defensive.

• Choose appropriate types for the parameters

• Ensure that your function does not crash or seg-fault.

• You may not use any methods of the C++ STL, except for the iostream header file for reading/writing to and from standard I/O.