resolve error in internship

[yuvraj-rathod-1202]

#56
i add feature to show previously added intern detail

Brief description of what is fixed or changed

Other comments

[yuvraj-rathod-1202]

Please review this

[Kishan-Ved]

Please resolve the conflicts. Then, we can merge this.

[yuvraj-rathod-1202]

conflict is resolved now it is able to merge, please consider this

[Kishan-Ved]

BUG:

1. add some internship data
2. Click on Add this
3. Uncheck the internships section
4. Add some other internship data
5. Click on add this

The preview shows the previously added internship also, ideally, it should not be there
The latex code also contains the previously added internship details
We can't delete the previously added internship (there is no delete button for it in the menu). Ideally, it should not be there because the user had unchecked the box, so all data added previously should be erased.

[yuvraj-rathod-1202]

I resolve the bug, please check this and provide your valuable feedback

[Kishan-Ved]

Great! There is another small bug: the update button isn't working as expected

Bug:

1. Add some internship data
2. Click on add this
3. Click on edit
4. Change data
5. Click on update

See the menu, it shows this:

[yuvraj-rathod-1202]

now it is fixed, please check this

[Kishan-Ved]

Great work! Thanks @yuvraj-rathod-1202 for this PR!