Design a String Compress(string input) system.
The system should support compressing an input string and later decompressing it back to the original form.
Example 1
Input 1: "This is soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo good"
Output 1: "This is s12o g18od"Example 2
Input 2: "this"Discussion
What will be the output?
A: You need to define it so that Decompress can decode and decompress it back.
这道题本质上是在设计一个可压缩、可解压的字符串处理系统，不只是做简单的字符替换，还要保证压缩后的结果能够被反向还原。题目图里强调了整体流程：UI 经过 Authentication 后，进入 validation，再做 normalization、persistence，并把部分工作交给 async processing，同时数据会落到 S3 和 PostgreSQL/Aurora 之类的存储中。解题时要先统一输入格式，再定义一种明确且无歧义的编码方式，例如对连续重复字符做 run-length 压缩，并确保解压时能准确恢复原串。核心关注点是字符串编码规则、可逆性、以及在系统设计中如何把校验、归一化、持久化和异步处理拆开。
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