C programing using structures, stacks strings!
Write a C program to alphabetize the USN for students on the following criteria.

1) Read one student name at a time

2) The first three alphabets of USN is 2BU

3) The first alphabet of a student's name is to be appended to 2BU as a fourth character, and the actual number should start from the 5th character.

For example

If you enter the student's name as Arya, his USN should be 2BUA1,

if you enter the student's name as Jai, his USN should be 2BUJ1,

if you enter the student's name as Shri, his USN should be 2BUS1,

if you enter the student's name as Ayur, his USN should be 2BUA2(2BUA1 is already assigned to Mr. Arya) and so on.

The program should display all the students' USN after every insertion.