newbie needs help!!!!!

void modify_rec(my_rec_t arr[], int size){
     int id;
     int test=0;
     int i;
     char c;
     char addr[40];
     printf("Enter id of the record to be modified:\n");
     scanf("%d%*c", &id);

                       
    for (i = 1; i < size+1; i++)
    {
        // next: compare names (hint: use a library function)
       
        if (arr[i].id == id)
        {
            test = i+1;


          if (test==0){
printf("Record does not exist.\n");
return size;
          }


        }
         

     }

     printf("Enter Address:\n");
      fgets(addr, 40, stdin);
      addr[strlen(addr)-1] = '\0';
      printf("Enter Age:\n");
        scanf("%d",&arr[test].age);

strcpy(arr[test].addr,addr);


right now, 2 cases...either the program will ask you for an address regardless of if there is a id that exists within arr[100] or it will continously say record does not exist