8. [20 marks] (Replace strings) Write the following function that replaces the

occurrence of a substring old_substring with a new substring

new_substring in the string s. The function returns true if string s is changed,

and otherwise, it returns false.

bool replace_strings(string& s,

const string& old_string,

const string& new_string)

Write a test program that prompts the user to enter three strings, i.e., s,

old_string, and new_string, and display the replaced string.

You can put the replace_strings function prototype, main() function, and the

implementation of replace_strings function in the single file a2q8.cpp. That

is, there will be two files need to be submitted for this program question. 1)

a2q8.cpp, 2) a script file a2q8result containing result.

Here are the sample runs:

Enter the string s: This is a string

Enter the old substring old_string: is

Enter the new substring new_string: ab

The replaced string is: Thaa aa a string

Enter the string s: This is a string

Enter the old substring old_string: it

Enter the new substring new_string: ab

No matches

write the code in c++ language please