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Question 2 (Strings) (10 marks) Write a C program which receives two strings: S1 and S2, and an integer I. String S1 is composed of letters (A, b, c, D ...etc) and digits (0 to 9) characters only, while S2 is empty. The function should copy to S2 all the digit characters representing the Ith integer in string Si. Example 1: Example 3: Given S1 = abc213fet23djg11dFG4 Example 2: Given S1 = abc213fet23djg11dFG4 If I is equal to 2 The function should copy 23 to S2 If I is equal to 1 Given S1 = abc213fet23djg11dFG87" If I is equal to 4 The function should copy 87 into S2 The function should copy 213 to S2 Do not use any ready function except strlen(). You have to write your own code In main do the following: 1. Define necessary strings for the function 2. Read a string and an integer number from user. 3. Call the function. 4. Print the result string