systemOT

1. Bit fields
   • bitfield in union
   • casting byte array to struct
2. Callback functions
   • callback function
   • callback function for file reading
   • callback function in sort function
3. Functions pointers
   • function pointer
4. Pointer, Array
   • pointer_Array
   • calculater Pointer
   • Pointer
5. structure
   • compond literal
   • double linked list
   • endian
   • struct_bytePadding
   • struct_Pointer
6. typecasting
   • typecasting
7. union
   • union