Refactor string concatenation to use f-strings for improved code quality

[sourcery-ai]

In the codebase, there are instances where string concatenation is used to construct strings, such as:

return masked + '@' + dom

It is recommended to use f-strings for better readability and performance. For example, the above can be refactored to:

return f"{masked}@{dom}"

Action Items:

• Search for occurrences of string concatenation used for building strings, especially with variables and literals.
• Refactor these instances to use f-strings instead.
• Ensure all tests pass after the refactor.

Reference: Sourcery Rule: use-fstring-for-concatenation

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I created this issue for @uditmanav17 from #3 (comment).

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