MacBook Pro 13 charging slowly

I have MacBook Pro 2017 13 inch . And it was perfectly working. I am facing problem of slow charging and decreasing the charge while plugging the charger also . And it charges **** slow. I reset smc, pram and reset my MacBook Pro also but nothing worked out . The condition of battery is shown normal and found that in power option in wattage there is showing only 12 watt whereas my charger is 61 watt. So please if anyone know the solution kindly reply.