海外大学C++入门课练习题: Queue, Class, Stack

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Assume you are in main.cpp define a function that is NOT SCOPED to any class. It is NOT a member of the ListInterface nor LinkedList classes. Your function should accept two lists. You will remove all values from the first list that are present in the second list. Example:
Lists before call:                                         Lists after call:
target: A, B, C, A, D, C, E, F, B, C, A                        target: A, A, D, E, F, A
toRemove: C, B, Q, Z                                        toRemove: C, B, Q, Z


template <typename T>
void removeHelper(ListInterface<T>& target, const ListInterface<T>& toRemove) {
//your code below