Apply padding to month param with leading zero

[mirsahib]

Problem: The run method in the scrapper.controller.js file throws a bill not exist error because the scrapping url should accept month parameter with leading zero.
Example:

// month param less than 10
https://dpdc.org.bd/service/ebill?btyp=current&year=2021&month=01&cno=24546800&email=
// month more than 10
https://dpdc.org.bd/service/ebill?btyp=current&year=2021&month=12&cno=24546800&email=

Solution:

const run = async function (req, res) {
  const year = req.query.year;
  const month = req.query.month.length===1 ? '0'+req.query.month:req.query.month; //add this line
  const customer_no = req.query.cno.split(",");
  //console.log({ year, month, customer_no });

  try {
    //error handling code
    if (checkParam(year) && checkParam(month) && checkParam(customer_no)) {
      const data = await getData(year, month, customer_no, res);
      res.status(200).json(data);
    } else {
      res.status(400).json({
        msg: "Parameters are undefined or null value",
        parameter: { year, month, customer_no },
      });
    }
  } catch (error) {
    res.status(500).json({ msg: error });
  }
};