how to write a correct search function in C?

Question

i have a problem in 'search' function, keep showing 'record not found' i have successfully save it into file and i can display it. can someone tell me in which part i wrote it wrong?

enter image description here

typedef struct vaccine{
    char vacname[20]; 
    char code[5];
    char country[20];
    int dosage, quantity;   
    float population;
}vaccine;

void addVaccine(){
    vaccine *v;
    FILE *fp;
    int n, i;
    printf("Enter how many vaccine you want: ");
    scanf("%d",&n);

    v= (vaccine*)calloc(n, sizeof(vaccine));
    fp = fopen("vaccine.txt","w");

    for(i=0;i<n;i++){
        printf("Enter Vaccine Name: ");
        scanf("%s", v[i].vacname);
        printf("Enter Code: ");
        scanf("%s", v[i].code);
        printf("Enter Country: ");
        scanf("%s", v[i].country);
        printf("Enter Dosage: ");
        scanf("%d", &v[i].dosage);
        printf("Enter Quantity: ");
        scanf("%d", &v[i].quantity);
        printf("Enter Population: ");
        scanf("%.2f", &v[i].population);    

        fwrite(&v[i],sizeof(vaccine),1,fp);
    }
    fclose(fp);
}

here is my search function which i have problem with;

void search(){
    vaccine v;
    FILE *fp;
    int i, code, found=0;
    fp = fopen("vaccine.txt","r");

    printf("Enter code to search: ");
    scanf("%s", &code);

    while(fread(&v,sizeof(vaccine),1,fp))
    { 
        if(v.code == code){
        found=1;
        printf("\n%s\t%s\t%d",
        v.vacname,v.code,v.quantity);
        }
    }
    if(!found)
    printf("\nRecord Not Found");
    fclose(fp);
}