I need help for C++

Instructions: Create an ADT character string (linked_char is name I am using) by using a linked list of characters.

The Main function must have a Menu List of options. Down below is what the Menu List should have.

1) Enter new string from user and store as linked list of characters in an ADT linked_char class

2) Get current length (number of characters stored) from linked_char Append a linked_char to another linked_char

3) Find index of character in a linked_char

4) Test if a linked_char is substring of another linked_char

5) Quit Program