Write a c++ program called bonus.cpp that declares a function char* find_string(string s, char x). This function takes a

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Write a c++ program called bonus.cpp that declares a functionchar* find_string(string s, char x). This function takesa string ‘s’, a character ‘x’, and returns a pointer to the firstoccurrence of ‘x’ in the string ‘s’. If the character doesnot exist, return a NULL pointer. (10 points)