Question

please use c language and use function method to solve it

Check Substring You are given two strings s1 and s2. Write a function isSubstring(char s1[], char s2[]) which takes two strings as input, and returns the start index if the second string is a substring of the first, else returns -1. (Case Insensitive) Note: Print the result in the main() function.

4.1 Example

4.1.1

Input: Starfish

Star

Output:

0

4.1.2

Input:

Starfish

Fish

Output: 4

4.1.3

Input: Exhibition habit

Output: -1