Fix two C++ functions: incrementByOne(int x) must increase the caller's integer, and dontChange(int* const p_x) must leave *p_x unchanged although its body adds rand() to *p_x.

Two C++ functions fail their sanity checks. void incrementByOne(int x) runs x++ and is expected to increase the caller's integer by 1. void dontChange(int* const p_x) is expected to leave *p_x unchanged, but its body is the single line (*p_x) += rand(), which you may not change. There is free space above dontChange that you may use. Fix both functions.