Apply mutation testing with mull

[chfast]

https://mull.readthedocs.io

[KoushikAD1234]

Hii @chfast Is this issue available to work on ?

[chfast]

Yes.

[KoushikAD1234]

I would like to work on this issue, right now going through with the documentation docs. Can you please assign it to me ?

[chfast]

I was able to install the mull toolchain and build evmone with it, with single file instrumented (as suggested by the docs).
This gave me this report: #1149.

[KoushikAD1234]

Okk, Will see and fix it