Enhance file utilities with secure temp file generation, MoveFile, aнd TouchFile #2
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…d TouchFile - Replace `math/rand` with `crypto/rand` for secure random name generation in `TempFileName`. - Improve `CopyFile` function to preserve file modes. - Add `MoveFile` function to handle file movement, including cross-device scenarios by using a copy-and-delete fallback. - Add `TouchFile` function to create or update file timestamps. - Update tests to cover new functionality and error cases - Enhance README.md with details about new and updated functions.
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MoveFilefunction to handle file movement, including cross-device scenarios by using a copy-and-delete fallback.TouchFilefunction to create or update file timestamps.math/randwithcrypto/randfor secure random name generation inTempFileName.CopyFilefunction to preserve file modes.