Follow a specific naming convention for variables and classes

[angad-k]

like parameters having p_name, member variables having m_name, etc.

[ayushgupta138]

Change the variable names according to the following convention :

1. Change variable names to camel case format with the first letter small.
2. Change class names to camel case format with first letter capital.
3. Prepend all variable names by the following convention :
   a) p_ => parameter variables
   b) l_ => local variables
   c) s_ => static variables
   d) m_ => member data variables.