3.2 Implementation Requirements Write a C program to (i) implement the following functions of a Stack using an integer array: - stack_init(): Make the stack empty - empty(): return true if the stack is empty. Return false if the stack is not empty - push(val) : add the item val to the stack - pop() : remove the item most recently added to the stack - top(): return the item most recently added to the stack, but do not remove it. (ii) the program reads in integer values as input: 3 - for a positive integer input value greater than 0 , the program will push the value into the stack - for any negative integer input value, the program will return the most recently added value from the stack if it is non-empty, i.e. top - for the input value 0 , the program will remove the most recently added value from the stack if it is non-empty, i.e. pop (iii) test your program with the following set of input