my work

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

typedef struct {
char Surname[16];
char Name[16];
char Patronymic[16];
int recBookNumber;
} student;

void addStudent(FILE **target, student s)
{
    fprintf(*target, "%s", s.Surname);
    fprintf(*target, "%s", s.Name);
    fprintf(*target, "%s", s.Patronymic);
    fprintf(*target, "%d", s.recBookNumber);
    fprintf(*target, "\n%s\n", "------------");
}

int main()
{
    student* people=NULL;
    FILE *p;
    p=fopen("db.txt", "a+");
    if(p==NULL) { printf("failed"); return 0; }
    int i=1;
    while(1){
        people=realloc(people, sizeof(student)*i);
        fgets(people[i-1].Surname, 16, stdin);
        fgets(people[i-1].Name, 16, stdin);
        fgets(people[i-1].Patronymic, 16, stdin);
        char temp[16];
        fgets(temp, 16, stdin);
        people[i-1].recBookNumber=atoi(temp);
        printf("Continue?");
        char c;
        if((c=getchar())!='Y') break;

        else {getchar(); i++;}
    }
    for(int k=0; k<i; k++)
    {
        addStudent(&p, people[k]);
    }

    fclose(p);
    p=NULL;
    return 0;
}