Need c programming with function, structure ,pointer and file.Need as early as possible.

6) typedef struct \{ char name[50]; int id; char dept[20]; double cgpa; \} student; i) Write a function void saveByDept (char fileName, char * deptName , student allStudents[], int size) that will save the information of all students who belong to the department with name pointed to by deptName into a text file. [The name of the file is given as an input parameter, filename]. [Once the file is created in part (i), it will contain the information of students who belong to a particular department. You will use this information in part (ii)] ii) Write another function to delete the students of the department with a CGPA greater than or equal to 3 from the file you have created in part (i)