Gop 2 day tang dan thanh 1 day tang (chuan)

#include <stdio.h>
#include <conio.h>
void main(){
    int i,i1,i2,n1,n2,d1[10],d2[10],d3[20];
    printf("Nhap so phan tu day 1: ");
    scanf("%d",&n1);
    for(i=1;i<=n1;i++){
        printf("d1[%d]= ",i);
        scanf("%d",&d1[i]);
    }
    printf("Nhap so phan tu day 2: ");
    scanf("%d",&n2);
    for(i=1;i<=n2;i++){
        printf("d2[%d]= ",i);
        scanf("%d",&d2[i]);
    }
    i1=1;
    i2=1;
    i=1;
    while (i<=n1+n2){
        if (i1<=n1&&i2<=n2) {
            if(d1[i1]>=d2[i2]){
                d3[i]=d2[i2];
                i2=i2+1;
                i=i+1;
            } else {
                d3[i]=d1[i1];
                i1=i1+1;
                i=i+1;
            }
        } else {
            if (i1>n1){
                d3[i]=d2[i2];
                i2=i2+1;
                i=i+1;
            } else {
                d3[i]=d1[i1];
                i1=i1+1;
                i=i+1;
            }
        }
    }
    printf("Xuat day d3: ");
    for (i=1;i<=n1+n2;i++){
        printf("%d ",d3[i]);
    }
}