refactor: improve code readability with clang-tidy fixes

[bobtista]

Container Empty Checks (readability-container-size-empty)

Before: if (container.size() == 0)
After: if (container.empty())

Explicit String Comparisons (bugprone-suspicious-string-compare)

Before: if (strcmp(a, b))
After: if (strcmp(a, b) == 0)

Applied automatically using clang-tidy checks:

• readability-container-size-empty
• bugprone-suspicious-string-compare

[xezon]

Can you please split this into 2 pulls? One for each tidy action.