somepeople post same question on chegg, but the answer was wrong

Write a C++ program that has the following functions:

int* ShiftByOne(int[], int);

This function accepts an int array and the arrays size as arguments. The function should shift all values by 1. So, the 1^st element of the array should be moved to the 2^nd position, 2^nd element to the 3^rd position, and so on so forth. Last item should be moved to the 1^st position. The function should modify the input array in place and return a pointer to the input array.

Int* GetMax(int[], int);

This function accepts an int array and the arrays size as arguments. The function should return the memory address of the maximum value found in the array.

unsigned int GetSize(char[]);

This function accepts a character array (C-String) and should return the size of the array.