C separating string with commas into vectors

I want to separate each line of a file into 2 vectors: v [i] .date and v [i] .value. However, when I run the code, no value I print is correct, and the outputs are random values. Is there something I should change?

  

Input
  02/20 / 18,11403.7
  02/19 / 18,11225.3
  02/18 / 18,10551.8
  02/17 / 18,11112.7
  02/16 / 18,10233.9

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


typedef struct
{
    char *date;
    long int *value;
}vetor;

int main(int argc,char **argv)
{
    FILE *btc;

    if((btc=fopen("BTC.csv", "r")) == NULL  )
    {
        printf("not found btc\n");
        exit(-1);
    }


    long int a=0;

    char linha[256];
    char *token = NULL;

    while (fgets(linha, sizeof(linha), btc) != 0)
    { 
            a++;
    }

    vetor *v;

    v=(vetor*)malloc(a*sizeof(vetor));

    char linha2[256];

    while (fgets(linha2, sizeof(linha2), btc) != 0)
    {
        for(int i=0;i<a;i++)
        {
            fscanf(btc,"%[^,]s",v[i].date);
            fscanf(btc,"%d[^,]",&v[i].value);
            fseek(btc, +1, SEEK_CUR);
        }
    }

    fclose(btc);    
    return 0;
}