C language Software Development header file organization problem

In most medium C language development projects, header files tend to be more than one. Generally, there is a common header file and a module header file for each module to use. and the module header files tend to use common header files, there is a place to note that it is best not to include the module header file in the public header file, because many of the contents of the common header file are likely to be used in the module header file.

If you include a module header file in a public header file, and the precompiled common header file encounters the module header file, inserting the module header file may reveal that part of the common header file that the module header file relies on has not yet appeared, which can lead to error prompts such as undefined type.