[Homework]write a C Program source code

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Pls send me source code:
write a c program in
1.Add employee
2.Add Department
3.Assign an employee to a deptment with start and end date
4.Exit

Employee:(Employee.txt)
1,e.number->(Auto numbering)
2,e.name
3,e.age->20 to 58
4,e.city

Department:(department.txt)
1,d.number
2,d.name

Emp-Dept:(empdept.txt)
1,e.number->name
2,d.number->name
3,Start date
4,End date