A national ID of a country uses 11 digits. national ID Formatd1d2d3d4d5d6d7dgd9d10d11 Example 978 0 1 3 2 1 3 0 8 The last digit d11 is a checksum, which is calculated from the other digits using the following formula: 10- (d1 + 3d2 +d3 + 3d4 + d5 + 3d6+d7 + 3d8 + d9 + 3d10)%10. If the checksum is 10, replace it with 0. 1. Write a function named readString that takes only an array of character as parameter named data, reads a string of size 11 from the user, and sore it the array data. The function should ask the user to enter a proper string of until the user enters a string of size 11 2. Write a function named checksum that takes only one input parameters str of type char* (null-terminated C strings of characters) and calculates and returns the check sum from the first 10 digits 3. Write the main function that . Prints your full name and Student ID Define a proper variable to store a c-string Properly call the function readString to read an 11-digit national ID displays valid national ID if the digit 11 equals the checksum calculated in part2 or invalid otherwise . 4. Add your name, your University ID number and section number as a comment at the beginning of this program