You can check whether a string is a substring of another string by using the find method in the str class. Write your own function to implement find. Write a program that prompts the user to enter two...

You can check whether a string is a substring of another string by using the find method in the str class. Write your own function to implement
find. Write a program that prompts the user to enter two strings and then checks whether the first string is a substring of the second string.