fix: use JSON encoding for args to preserve spaces in values

[12end]

Summary

Fix issue #15: Arguments containing spaces were incorrectly split after encryption/decryption because the code used strings.Join/strings.Split with space as delimiter.

Problem

The original code in cargs.go used:

input := []byte(strings.Join(os.Args[2:], " "))
// ...
os.Args = append(os.Args[:1], strings.Split(string(output), " ")...)

This caused arguments with internal spaces (e.g., --name "hello world") to be split incorrectly after decryption, resulting in the argument being broken into multiple arguments.

Solution

Use JSON encoding (json.Marshal/json.Unmarshal) to serialize the args slice instead of space-based join/split. This correctly handles:

• Arguments with spaces (e.g., "hello world")
• Empty arguments
• Arguments with special characters
• Multiple consecutive spaces

Changes

1. encoding.go (new file): Added encodeArgsJSON and decodeArgsJSON functions that use JSON serialization
2. cargs.go: Updated to use the new JSON encoding functions instead of strings.Join/strings.Split
3. cargs_test.go (new file): Added comprehensive tests for the encoding/decoding functions

Testing

All tests pass:

• TestEncodeDecodeArgs - Tests base64 per-argument encoding
• TestEncodeDecodeArgsJSON - Tests JSON encoding (the actual implementation)
• TestEncodeDecodeEmptyArgs - Tests empty argument handling
• TestEncodeDecodeEmptyArgsJSON - Tests JSON empty argument handling

Closes #15

@12end can click here to continue refining the PR