How to check if string entered already exists in C

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C

struct

I am here with a doubt to create a function to check if a string entered by the user already exists in a struct.

I have the following struct to store cars data:

typedef struct
    {
        char brand;
        char car_plate[10];
        char model;
    } stCar cars;

For example when asked to enter the car_plate, i need a function to check if that car_plate already exists in the stCar struct because can not exist two cars with the same car_plate.


I don't know if this will work:

int main()
{
  stCar cars;
  int countCars =0;

void entercar(stCars cars[], int *countCars)
   {

       char car_plate_Aux[10];
       int position;
           do
           {

               printf("\nEnter car plate:");
               fgets(car_plate_Aux);
               findcar_plate(cars,*countCars, car_plate_Aux)
             if (position != -1)
             {
               printf("This car already exists!\n");
           }
       }
       while(position != -1);

       cars[*countcars].car_plate =car_plate_Aux;
   }

char findcar_plate(stCars cars[], int countCars, char car_platetofind)
    {
        int i, position;
    
        position = -1;
    
        for(i = 0 ; i < coutCars ; i++)
        {
            if (cars[i].car_plate == car_platetofind)
            {
                position=i;
                i=countCars;
            }
        }
        return position;

Someone can please help me?