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roll_two_dice

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Write a function named roll_two_dice that prompts the user for a desired sum, then repeatedly rolls two six-sided dice (using the rand function to generate random numbers from 1-6) until the sum of the two dice values is the desired sum. Here is the expected dialogue with the user: 

Desired sum: 9
4 and 3 = 7
3 and 5 = 8
5 and 6 = 11
5 and 6 = 11
1 and 5 = 6
6 and 3 = 9

(Because this problem uses random numbers, our test cases check only the general format of your output.)

Function: Write a C function as described, not a complete program.

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