Please complete the following C$++$ call function part, only this part is complete, you don't need to write the main function

The pre$-$code and other helper functions that may be required are shown in the pictures$$

$//$Adds a user to the users's linked list.

$//$This function takes as input:

$//1)$ the users list

$//2)$ the user id

$//3)$ its name.

$//$ And works as follows:

$//1)$ If there is a user with the same user id return false

$//2)$ Otherwise,

$//$ a$)$ Add the user maintaining an increasing order

$//$ of user ids in the list $($see examples bellow$)$

$//$ b$)$ return true

bool add$\_$user$($User $*$&user$\_$head, const unsigned int uid, const char name$[$MAX$\_$CHAR$\_$NUM$])\{$

$//$ TODO: Write code to implement add$\_$user

return false;

$\}$

For example, here are some examples of add new users in the image