Added column in contest challenges table

Signed-off-by: Shivam Dixit <shivamd001@gmail.com>
Added contest challenge scanner

Signed-off-by: Shivam Dixit <shivamd001@gmail.com>
Added searching functions in contest challenges model

Signed-off-by: Shivam Dixit <shivamd001@gmail.com>
Deleted extra line

Signed-off-by: Shivam Dixit <shivamd001@gmail.com>
Changed directory structure of challenges and added new path in more.php

Signed-off-by: Shivam Dixit <shivamd001@gmail.com>
Added files in new path

Signed-off-by: Shivam Dixit <shivamd001@gmail.com>