Write a C program that reads unknown number of students' information from a file,

stores it in an array of struct, and performs basic operations such as displaying student

information $($name$,$ surname, student number, grade$),$ ranking the students according to their

grade in descending order and calculating the class average.

The program should have the following:

struct Student that stores the following student information:

name: A character array to store the student's name.

surname: A character array to store the student's surname.

number: A character array to store the student's number.

grade: An integer to store the student's grade.

readStudentsFromFile function will read unknown number of student information

from a file specified by the user. Each line in the file represents a student's information

in the following format: $[$Name$][$Surname$][$Student Number$][$Grade$].$ Finally it will

return the number of students read from the file. This function will have $2$ parameters;

character array filename and array of struct Student. If the file cannot be opened $($wrong

file name entered by user$),$ it will print an error message like below.

Enter file name: stu.txt

Error: Unable to open file stu.txt

printStudents function will display student information on the screen which is stored

in the structured array. Each student's information should be printed in the format:

$[$Name$][$Surname$][$Student Number$][$Grade$].$ Each student's information should be

printed on a separate line. This function will take $2$ parameters; array of struct Student

and integer number of students. rankStudents function will rank the students based on their grades in descending order

$($highest grade to lowest grade$).$ After ranking, it will print the rank, name, surname,

number, and grade of each student in a formatted manner $($the format is given in the

sample run$).$ This function will take $2$ parameters; array of struct Student and integer

number of students.

The calculateClassAverage function will calculate and return the class average based

on the grades of all students as a double value. This function will take $2$ parameters;

array of struct Student and integer number of students.

The int main$()$ function will declare variables, including an array of Student structs and

a filename. It will prompt the user to enter the filename from which the student

information will be read. It will read the student information using the

readStudentsFromFile$()$ function. If an error occurs during file reading, it will exit the

program with an error code. It will print student information, rank students, calculate

the class average and print the class average. Finally, it will return $0$ to indicate

successful execution.

Create a text file named studentinformation.txt containing student information in the

specified format: $[$Name$][$Surname$][$Student Number$][$Grade$].$ Each student's information

should be on a separate line like shown below. Sample Run: