[Bug]: Inconsistent Return Types in RelaxCalc

[atulcthakur]

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Version

v0.3.2

Which OS(es) are you using?

• MacOS
• Windows
• Linux

What happened?

RelaxCalc currently return inconsistent types.
For instance, if the input type is of Structure then both Single Point and Relaxation calculation return Structure. However, if the input type is of Slab then Relaxation calculation returns Structure, but Single Point energy calculation returns Slab.
A simple instance where this comes up is when type checking with mypy, but it could potentially be problematic in other cases.

Solution:

Either consistently return aStructure or cast to the original type. The latter would be more beneficial as Slab often has more information for example, but either is fine.

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