Используя динамическую структуру список подсчитать сумму отрицательных чисел в нем

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
typedef struct node_t
{
    int value;
    struct node_t *next;
}   TList;
 
//-----------------------------------------------------------------------------
TList* Push(TList** list, int value)
{
    TList* node = (TList*) malloc(sizeof(TList));
    node->value = value;
    node->next = *list;
 
    *list = node;
 
    return *list;
}
//-----------------------------------------------------------------------------
int Pop(TList** list)
{
    int value = 0;
 
    if (*list)
    {
        TList* node = *list;
        *list = (*list)->next;
        value = node->value;
        free(node);
    }
 
    return value;
}
//-----------------------------------------------------------------------------
void Clear(TList** list)
{
    while (*list)
    {
        Pop(list);
    }
}
//-----------------------------------------------------------------------------
void Print(TList* list)
{
    for (; list; list = list->next)
    {
        printf("%d ", list->value);
    }
    printf("\n");
}
//-----------------------------------------------------------------------------
TList* GetGenList(size_t count, int min, int max)
{
    TList* list = NULL;
 
    while (count--)
    {
        Push(&list, rand() % (max - min) + min );
    }
 
    return list;
}
//-----------------------------------------------------------------------------
int IsPositive(const TList* node)
{
    return (node->value >= 0);
}
//-----------------------------------------------------------------------------
int IsNegative(const TList* node)
{
    return (node->value < 0);
}
//-----------------------------------------------------------------------------
size_t Count(TList* list, int (*func)(const TList*))
{
    size_t count = 0;
 
    for (; list; list = list->next)
    {
        if (func(list))
        {
            count++;
        }
    }
 
    return count;
}
//-----------------------------------------------------------------------------
int Sum(TList* list, int (*func)(const TList*))
{
    int sum = 0;
 
    for (; list; list = list->next)
    {
        if (func(list))
        {
            sum += list->value;
        }
    }
 
    return sum;
}
//-----------------------------------------------------------------------------
 
int main()
{
    srand(time(NULL));
 
    TList* list = GetGenList(20, -100, 100);
 
    printf("list:  ");
    Print(list);
 
    printf("sum of negative numbers = %d\n", Sum(list, IsNegative));
 
    printf("count positive = %u\n", Count(list, IsPositive));
    printf("count negative = %u\n", Count(list, IsNegative));
 
    system("pause");
 
    Clear(&list);
 
    return 0;
}