Improve convert func from string_util

[ThibFrgsGmz]

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Change Description

This PR includes the following changes into the convert() function from string-util.py:

1- Replaces conditional assignment to a variable with an if expression [ref]
2- Convert the final conditional into a guard clause [ref]
3- Inline immediately returned template variable [ref]

Rationale

Using a guard condition in this way does not indent the rest of the function. In general, the less indentation there is, the easier it is to understand the code.

Testing/Review Recommendations

(void)

Future Work

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