cant compare values of string c program

I am trying to find index of 1s in my string to get Power of Two. Dont know how to deal with pointer. Any help over this.

    int main()
{   int i,j,k;  
    char inbit[20], count[16];
    char fdata[32],coeff[17],signb[17];
    printf("Enter X(n) data file with extension: ");
    scanf("%s",inbit);
    //strcpy(inbit,flr);
    printf(" Data in file :%s\n", flr(inbit));
    //printf(" Hex conversion : %s\n", hexc(flr(inbit)));
    strcpy(fdata,hexc(flr(inbit)));
    printf(" Hex conversion : %s\n", fdata);
    memcpy(signb, fdata, 16);
    memcpy(coeff, fdata +16, 16);
    signb[16] = '\0';
    coeff[16] = '\0';
    printf(" part1  signbit : %s\n", signb);
    printf(" part2 valuebit : %s\n", coeff);
    for (i=0;i<16;i++)
        {j=0;
        if (coeff[i] =1)
         {count[j]=i;
          j++;}
        }
    printf("%s\n",count);
return (0);

} Undoubtedly output is null because coeff[i] provides location instead of value as being a pointer. Any help ?