Fix some quality issues (#1914)

Fix some quality issues (#1914)

* Add .deepsource.toml

* Fix unnecessary typecasting on `bytes.Buffer`

* Fix check for empty string

* Replace nested if block with else-if

* Replace nested if block with else-if

* Replaced string.Replace() with string.ReplaceAll where n<0

* Remove deepsource toml file

Signed-off-by: siddhant-deepsource <siddhant@deepsource.io>
Co-authored-by: DeepSource Bot <bot@deepsource.io>
Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>