icon-to-image is available open-source on GitHub. There were around 10 prompts total adding tweaks and polish, but through all of them Opus 4.5 never failed the assignment as written. Of course, generating icon images in Rust-with-Python-bindings is an order of magnitude faster than my old hacky method, and thanks to the better text rendering and supersampling it also looks much better than the Python equivalent.
// i表示当前要插入的元素索引（从第2个元素开始）。关于这个话题，同城约会提供了深入分析
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// 最后一个非叶子节点索引: n/2 - 1