How can I make the delete function work properly where it deletes a node based on its ID

#include

#include

using namespace std;

struct Node $\{$

int id;

string name;

float gpa;

Node$*$ next;

$\}$;

Node$*$ createNode$($int id$,$ const string& name, float gpa$)\{$

Node$*$ newNode $=$ new Node;

newNode$->$id $=$ id;

newNode$->$name $=$ name;

newNode$->$gpa $=$ gpa;

newNode$->$next $=$ nullptr;

return newNode;

$\}$

void addNode$($Node$*$& head, int id$,$ const string& name, float gpa$)\{$

Node$*$ newNode $=$ createNode$($id$,$ name, gpa$)$;

if $($head $==$ nullptr$)\{$

head $=$ newNode;

return;

$\}$

if $($head$->$id $>$ id$)\{$

newNode$->$next $=$ head;

head $=$ newNode;

return;

$\}$

Node$*$ current $=$ head;

while $($current$->$next $!=$ nullptr && current$->$next$->$id $<$ id$)\{$

current $=$ current$->$next;

$\}$

if $($current$->$next $!=$ nullptr && current$->$next$->$id $==$ id$)\{$

cout $<<$ "Duplicate ID found. Please enter other ID$."<<$ endl;

delete newNode;

return;

$\}$

newNode$->$next $=$ current$->$next;

current$->$next $=$ newNode;

$\}$

void deleteNode$($Node$*$& head, int id$)\{$

if $($head $==$ nullptr$)\{$

cout $<<$ "List is empty. Cannot delete." $<<$ endl;

return;

$\}$

if $($head$->$id $==$ id$)\{$

Node$*$ temp $=$ head;

head $=$ head$->$next;

delete temp;

return;

$\}$

Node$*$ current $=$ head;

while $($current$->$next $!=$ nullptr && current$->$next$->$id $!=$ id$)\{$

current $=$ current$->$next;

$\}$

if $($current$->$next $==$ nullptr$)\{$

cout $<<"$ID not found. Cannot delete." $<<$ endl;

return;

$\}$

Node$*$ temp $=$ current$->$next;

current$->$next $=$ current$->$next$->$next;

delete temp;

$\}$

void displayList$($const Node$*$ head$)\{$

if $($head $==$ nullptr$)\{$

cout $<<$ "List is empty." $<<$ endl;

return;

$\}$

const Node$*$ current $=$ head;

while $($current $!=$ nullptr$)\{$

cout $<<"$ID: $"<<$ current$->$id $<<",$ Name: $"<<$ current$->$name $<<",$ GPA: $"<<$ current$->$gpa $<<$ endl;

current $=$ current$->$next;

$\}$

$\}$

$//$ Other functions like Modify, Purge, Search can be implemented similarly

int main$()\{$

Node$*$ head $=$ nullptr;

bool created $=$ false;

while $($true$)\{$

cout $<<$ "Enter command" $<<$ endl;

cout $<<"1.$ Create

$2.$ Add

$3.$ Delete

$4.$ Display

$5.$ Modify

$6.$ Purge entire list

$7.$ Search for node

$8.$ Exit the program" $<<$ endl;

string command;

cin $>>$ command;

if $($command $=="1")\{$

created $=$ true;

cout $<<$ "Linked list created." $<<$ endl;

$\}$ else if $($command $=="2")\{$

if $(!$created$)\{$

cout $<<$ "Create Linked list first." $<<$ endl;

continue;

$\}$

int id;

string name;

float gpa;

cout $<<$ "Enter ID: $"$;

cin $>>$ id;

cout $<<$ "Enter Name: $"$;

cin $>>$ name;

cout $<<$ "Enter GPA: $"$;

cin $>>$ gpa;

cout $<<$ "Node added." $<<$ endl;

addNode$($head$,$ id$,$ name, gpa$)$;

$\}$ else if $($command $=="3")\{$

if $(!$created$)\{$

cout $<<$ "Create Linked list first." $<<$ endl;

continue;

$\}$

$//$ Implement delete functionality

$\}$ else if $($command $=="4")\{$

if $(!$created$)\{$

cout $<<$ "Create Linked list first." $<<$ endl;

continue;

$\}$

displayList$($head$)$;

$\}$ else if $($command $=="5")\{$

if $(!$created$)\{$

cout $<<$ "Create Linked list first." $<<$ endl;

continue;

$\}$

$//$ Implement modify functionality

$\}$ else if $($command $=="6")\{$

if $(!$created$)\{$

cout $<<$ "Create Linked list first." $<<$ endl;

continue;

$\}$

$//$ Implement purge functionality

$\}$ else if $($command $=="7")\{$

if $(!$created$)\{$

cout $<<$ "Create Linked list first." $<<$ endl;

continue;

$\}$

$//$ Implement search functionality

$\}$ else if $($command $=="8")\{$

break;

$\}$ else $\{$

cout $<<$ "Invalid command. Please try again." $<<$ endl;

$\}$

$\}$

return $0$;

$\}$