RTC DS1307 issue

Projects General Guidance
4 
 Wire.write(0);

Wire.requestFrom(0x68, 7);
  Wire.write(bin_to_bcd(seconds));
  Wire.write(bin_to_bcd(minutes));
  Wire.write(bin_to_bcd(hours));
  Wire.write(bin_to_bcd(week));
  Wire.write(bin_to_bcd(days));
  Wire.write(bin_to_bcd(months));
  Wire.write(bin_to_bcd(Year));
  Wire.endTransmission();*/

This is not how you use Wire. Please read this: