a. Overload the operator + for the class newstring 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 newstring objects.
b. Overload the operator += for the class newstring to perform the following string concatenation. Suppose that s1 is "Hello " and s2 is "there". Then, the statement:
s1 += s2;
should assign "Hello there" to s1, where s1 and s2 are newstring objects.
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