$(5$ pts$)$ Part $3$: Handling C$++$ String functions

Create a function named part$3$ that is invoked from the main function and the prototype is void part$3().$ Write function body with the following requirements:

Declare both str$1$ and str$2$ variables:

string str$1="$C$++$ is a Swiss pocketknife of programming language.";

string str$2=$ "has been called";

Display the content of str$1$ and str$2.$ Print the number of characters in str$1$ and str$2.$

Extract the $12$ characters starting from position $9$ in str$1$ and display them.

Insert "computer" into str$1$ starting at the ${31}^{st}$ position and display the contents of variable str$1.$

Starting from the $4^{th}$ position of str$1,$ replace $4$ characters with str$2.$ Display the contents of str$1.$

Remove $9$ characters starting from position $42$ in str$1.$ Display the contents of str$1.$

Sample Output