(Sort characters in a string) Rewrite the sort function in Programming Exercise using the...

(Sort characters in a string) Rewrite the sort function in Programming Exercise using the sort function introduced in Section 11.8. (Hint: Obtain a C-string from the string and apply the sort function to sort the characters in the C-string array, and obtain a string from the sorted C-string.) Write a test program that prompts the user to enter a string and displays the new sorted string. The sample run is the same as in Programming Exercise.

Programming Exercise. (Sort characters in a string) Write a function that returns a sorted string using the following header:

string sort(string& s)

Write a test program that prompts the user to enter a string and displays the new sorted string. Here is a sample run of the program: