Merging two integer arrays -- 1-D Arrays -- DSA in C

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#include<stdio.h>
#include<stdlib.h>
 
// Finalised and imrproved version of merging two integer arrays.
 
int main() {
 
    int size = 10;
 
    int *arr1, *arr2;
 
    arr1 = (int *)malloc(size * sizeof(int));
    arr2 = (int *)malloc(size * sizeof(int));
 
    int i, j, n1, n2,tracker, m = 0;
 
    printf("Enter number of elements for first array: ");
    scanf("%d", &n1);
    printf("\n");
 
    for(i=0; i<n1; i++) {
 
        printf("arr1[%d] = ", i);
        scanf("%d", &arr1[i]);
        printf("\n");
 
    }
 
    tracker = i; // stores where the last element was entered in arr1.
 
    printf("Enter number of elements for second array: ");
    scanf("%d", &n2);
    printf("\n");
 
    for(i=0; i<n2; i++) {
 
        printf("arr2[%d] = ", i);
        scanf("%d", &arr2[i]);
        printf("\n");
 
    }
 
    m = n1+n2;
 
    // append elements from arr2 to arr1
 
    j = 0;
 
    for(i=tracker; i<m; i++) {
 
        arr1[i] = arr2[j];
        j++;
 
    }
 
    printf("The merged array is: \n");
 
    for(i=0; i<m; i++) {
 
        printf("arr3[%d] = %d \n", i, arr1[i]);
 
    }
 
 
    // cleanup 
 
    free(arr1);
    free(arr2);
 
 
 
    return 0;
}

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