| # Memory Operations | |
| ## Problem Description | |
| Implement byte-wise copy, move, and fill operations. | |
| ## Input | |
| The functions receive character pointers and any byte value or length arguments described by their C signatures. | |
| ## Output | |
| Each function returns or writes the result prescribed by the corresponding standard string or memory operation. | |
| ## Constraints | |
| Strings, byte arrays, capacities, and integer arguments satisfy the validity and bounds stated by each function contract. | |
| ## Source | |
| C string-library benchmark adapted by the QCP LLM benchmark suite. | |