fix: wrong function name in getCStringLength assertion message

[hilbert149]

fix: wrong function name in getCStringLength assertion message

[greptile-apps]

Greptile Summary

Corrects the assertion diagnostic in Value::getCStringLength() so it names the function that raised the assertion.

• Replaces the incorrect Json::Value::asCString() reference with Json::Value::getCStringLength().
• Does not alter control flow, data handling, or public API behavior.

Confidence Score: 5/5

The PR appears safe to merge because it only corrects an assertion message without changing runtime logic.

The changed string accurately identifies the function containing the assertion, while the assertion condition and all subsequent behavior remain unchanged.

Important Files Changed

Filename	Overview
src/lib_json/json_value.cpp	The assertion text now accurately identifies getCStringLength(); no functional issue was found.

_{Reviews (1): Last reviewed commit: "fix: wrong function name in getCStringLe..." | Re-trigger Greptile}