9. Consider the class newString as described in the newString Programming Example:

class newString

{

public:

.

.

.

private:

char *strPtr; // pointer to the char array that holds the string

int strLength; // variable to store the length of the string

};

a. Overload the operator + to perform string concatenation. For example, if s1 is "Hello " and s2 is "there", the statement: s3 = s1 + s2; should assign "Hello there" to s3, where s1, s2, and s3 are newStringobjects.

b. Overload the += operator to perform the string concatenation as follows. Suppose that s1 is "Hello " and s2 is "there". Then the statement: s1 += s2;should assign "Hello there" to s1, wh+6++ere s1 and s2 are newStringobjects.

You may use the functions strcat() and strlen() from the cstring library.