Implement UUID generation in addPersonToList and ensure uniqueness across existing nodes

src/users.c

@@ -9,11 +9,35 @@
 #include <termios.h>
 #include <string.h>
 
-int addPersonToList(
+uint16_t generateUUID
+(
+    node_t *_head
+)
+{
+    uint16_t uuid = rand() % (UINT16_MAX - 1 + 1) + 1;
+    node_t *current = _head;
+    while (current != NULL)
+    {
+        if (current->user.uuid == uuid)
+        {
+            uuid = rand() % (UINT16_MAX - 1 + 1) + 1;
+            current = _head;
+        }
+        else
+        {
+            current = current->next;
+        }
+    }
+    return uuid;
+}
+
+int addPersonToList
+(
     node_t **_head,
     char *_name,
     char *_surname,
-    uint32_t _department)
+    uint32_t _department
+)
 {
     node_t *new_node = (node_t *)malloc(sizeof(node_t));
     if (new_node == NULL)
@@ -26,6 +50,7 @@ int addPersonToList(
         return 0;
     }
 
+    new_node->user.uuid = generateUUID(*_head);
     new_node->user.name = (char *)malloc(strlen(_name) + 1);
     new_node->user.surname = (char *)malloc(strlen(_surname) + 1);