apt commands doesn't work

Question

apt already worked fine. but in order to solving package not found error I used bellow commands

sudo sed -i -e s/universe//g /etc/apt/sources.list
sudo sed -i -e s/main/"main universe"/ /etc/apt/sources.list

And now whenever I use any of apt commands I face this error

  $ sudo apt-get update
E: Malformed entry 15 in list file /etc/apt/sources.list (Component)
E: The list of sources could not be read.

Is there any solution??!