feat: complete version number character copying

[menshibin]

Description

Complete version number character copying.

jiar: https://jira.taosdata.com:18080/browse/TD-38234

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @menshibin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on improving code correctness and safety. It addresses a bug in Python example scripts that caused incorrect timestamp generation by ensuring the proper loop variable is used. Additionally, it enhances a C utility by implementing a safer string formatting function to mitigate buffer overflow risks, contributing to overall system stability.

Highlights

• Python Example Fixes: Corrected a logical error in two Python example scripts (stmt_native.py and stmt_ws.py) where the incorrect loop variable was used for timestamp generation, leading to potentially incorrect data.
• C Code Safety Improvement: Enhanced the robustness of the tools_cJSON_Version function in toolscJson.c by replacing sprintf with snprintf to prevent potential buffer overflows when formatting the version string.

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[gemini-code-assist]

Code Review

This pull request introduces a few changes. The main one, reflected in the title, is a security improvement in toolscJson.c which replaces the unsafe sprintf with snprintf to prevent potential buffer overflows when constructing the version string. I've suggested a further improvement to increase the buffer size to avoid version string truncation.

Additionally, there are two small but important bug fixes in the Python example files (stmt_native.py and stmt_ws.py), where an incorrect loop variable was used for generating timestamps. The changes are correct.