implementing small directory tree in c HELP

ok i have an assigment to implement a binary directory tree

we have to use enumeration with labels Folder and File

we have to define type struct FOLDER with elements: name which is a dynamicly string,left and right pointer to the structure and indentifiar which is type enum

we have to define struct FILE with elements name identifiar and int data

the part above is clear to me

but the second part is blurry

define a function which inserts a childe node to the specific node and if that new node has the identifiar File it should be casted from type FOLDER* to type FILE*, the information of the node should be inserted in theis function
THIS IS REALLY CONFUSING TO ME

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Code:

Code:

01 typedef enum TIP 02 { 03 Folder, 04 File 05 }TIP; 06 typedef struct folder 07 { 08 char *name; 09 TIP ident; 10 struct folder *left,*right; 11 }FOLDER; 12 typedef struct datoteka 13 {char *name; 14 int data; 15 TIP ident;