Find the error in the following function and show how to fix it.

 int periodCount(const char *filename) { FILE * fp; 

 int n = 0; if ( (fp=fopen(filename, "r"))!=NULL) { 

 while (fgetc(fp) != EOF) if (fgetc(fp) == '.') n++; 

 fclose(fp); } 

return n; }