write a C program concerns developing a system similar to Microsoft Teams Class Notebook having actors: Students, Teachers, and System Administrator. The system has folders:

- Course_materials, where Teachers can write and read, and Students can read

- Teachers_materials, where Teachers only can read and write

- Students materials for each student individually; only Student-owner and Teachers have read and write access to each particular Students materials

- System administrator introduces Teachers and Students, creates folders

-Authenticity of the documents is verified by RSA signature (number of bits is 31, hash function is 24-bit calculated as XOR of 3-byte words comprising a document padded if necessary by 0101..01 sequence of bits).