You are given a library, container.o and the following .h file signatures: void add (int n, container* c);/* adds n to c */int get (int n container* c);/* returns 1 if n is in c, 0 otherwise */int remove (int n, container* c);/* returns 1 if n was in c; after return n is not in c!*/container* newContainer();/* returns a new container if memory avail */void removeAll (int n container* c);/* removes all instances of the number n from c*/. int size container* c) return the number of elements in c*/write a unit test that verifies that removeAll properly deletes all copies of a number that appears more than once in the container c