Am I creating a memory leak and how to fix it

I am asking because I am creating an initialArray, but then I point it to a new array without freeing the initially allocated space. I tried to do free(initialArray) before pointing it to my newArray, so I will free up the previously used array - it'll be like:

free(initialArray);
initialArray = newArray;

but I am getting a core dump. any help?

#include <stdio.h>
#include <stdlib.h>

#define ENLARGE_SIZE(x, y) x += y
#define SIZE_INCREMENT 10

int *get_set();

int main() {
    int i = 0;
    int *set = get_set();
    printf("Array elements:\n");
    while (*(set + i) != '\0') {
        printf("%d,%d\n", *(set + i), i);
        i++;
    }
    free(set);
    return 1;
}

int *get_set() {
    int *initialArray = malloc(sizeof(int) * SIZE_INCREMENT);
    int arraySize = 5;
    int arrayElementCount = 0;
    int scannedInt;
    int i = 0;
    while (scanf("%d", &scannedInt) != EOF) {
        printf("Scanned %d\n", scannedInt);
        arrayElementCount++;
        if (arraySize == arrayElementCount) {
            int *newArray = realloc(initialArray, sizeof(int) * (ENLARGE_SIZE(arraySize, SIZE_INCREMENT)));
            initialArray = newArray;
            arraySize += SIZE_INCREMENT;
        }
        *(initialArray + i) = scannedInt;
        i++;
    }
    return initialArray;
}