a$.$ Overload the operator $+$ for the class newString to perform string concatenation. For example, if s$1$ is "Hello $"$ and s$2$ is "there", the statement

s$3=$ s$1+$ s$2$;

should assign "Hello there" to s$3,$ where s$1,$ s$2,$ and s$3$ are newString objects. $(6)$

b$.$ Overload the operator $+=$ for the class newString to perform the following string concatenation. Suppose that s$1$ is "Hello $"$ and s$2$ is "there". Then the statement

s$1+=$ s$2$;

should assign "Hello there" to s$1,$ where s$1$ and s$2$ are newString objects. $(6)$

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