Can someone tell me why am i getting this error? - c

Question

I wrote a program that has a menu. First is double the space of the table, second minimize the space of the table by half, etc. Here is my code:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void double_space(int *table, int *n);
void half_space(int *table, int *n);
void fill(int *table, int n, int start, int finish);
void main()
{
int N = 4;
int *t;
int i, choice;
t = (int *)malloc(N*sizeof(int));
if(t == NULL)
{
printf("Unable to allocate memory...");
exit(0);
}
for (i=0; i<N; i++)
{
t[i] = i;
}
while (1)
{
printf("\tMENU\n");
printf("1) Double the size of table\n");
printf("2) Minimize the size of table\n");
printf("3) Print table\n");
printf("4) Exit the program\n");
printf("Choose one of the above: ");
scanf("%d", &choice);
switch (choice)
{
case 1:
double_space(t, &N);
fill(t, N, N/2, N-1);
printf("\nTable is double in size");
break;
case 2:
half_space(t, &N);
fill(t, N, N/2, N-1);
printf("\nTable is half in size");
break;
case 3:
for (i=0; i<N; i++)
{
printf("%d ", t[i]);
}
printf("\n");
break;
case 4:
exit(0);
default:
printf("Invalid choice...");
break;
}
}
}
void double_space(int *table, int *n)
{
*n = (*n)*2;
table = (int *)realloc(table, *n);
if(table == NULL)
{
printf("Unable to allocate memory...");
exit(0);
}
}
void half_space(int *table, int *n)
{
*n = (*n) / 2;
table = (int *)realloc(table, *n);
if(table == NULL)
{
printf("Error allocating memory...");
exit(0);
}
}
void fill(int *table, int n, int start, int finish)
{
int i;
if(start>=0 && start<=finish && finish<=n-1)
{
srand(time(NULL));
for (i=start; i<=finish; i++)
{
table[i] = rand() % 100;
}
}
}
After choosing the First choice and then the 3rd choice to print the table it prints the doubled size table. Then when i choose again the 1st choice it outputs this error:
realloc(): invalid next size
Aborted (core dumped)