Make an IMGUI library from scratch
版本：SDL version 2.0.9 (stable)
1.在Windows中使用 where cl 来判断 cl 是否存在（是否可用）。
2.where cl > nul 2>&1表示：把STDOUT（1）和STDERR（2）重定向到 nul中，即忽略这两个输出。
command > filename 2>&1 ：把标准输出和标准错误一起重定向到一个文件。
command >nul 2>nul：隐藏程序输出结果。
3.|| ：连接两个命令,当 || 前的命令失败时,才执行||后的命令。
4.call与start命令：
call命令：在同一个cmd.exe中运行。
start命令：该命令会另外启动一个cmd.exe来运行程序，或者脚本。
# 号：把宏参数变为一个字符串## 号：把两个宏参数连接起来
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