The String class that we created in class can create, print, and concatenate, but not much else. To make it more useful add a substring searching method to it.
The file index_of.cc contains a program that allows the
user to test the IndexOf method in the String class. For this assignment
write the IndexOf function. The function should search for the
specified substring after the specified index. If it finds the substring, it
should return the index of the first character of the first occurance of the
substring. If it can not find the substring, it should return -1. Your code
does not have to do bounds checking on the beginning index.
Tar your code in a file that contains your name and submit it on course Inquire site.