# LLM Language Refactoring & ReGrade

When LLMs transform code between languages — C to Python and back — ReGrade uses field-level comparison to verify that every version behaves identically, so you can migrate to memory-safe languages with confidence.

## The Refactoring Loop

1. Original application (V1.0) runs with real traffic recorded by ReGrade  
2. LLM transforms source code from C to a memory-safe language (e.g. Rust)  
3. ReGrade replays recorded traffic against the new language version  
4. ReGrade compares responses to verify behavioral equivalence  
5. LLM transforms the memory-safe code back to C, preserving safety fixes  
6. ReGrade verifies the final C code (V1.1) matches original behavior

## Benefits

### Memory safety verification

Confirm buffer overflows and memory vulnerabilities are eliminated without changing application behavior.

### Automated equivalence testing

Field-level comparison catches behavioral differences that unit tests miss during language transformations.

### Confident language migrations

Move between languages knowing ReGrade verifies every API response matches across versions.

### Faster refactoring cycles

LLM-driven transformations validated automatically, reducing manual review from days to minutes.