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12345678910111213141516171819202122232425262728293031323334353637383940This directory is intended for project header files.A header file is a file containing C declarations and macro definitionsto be shared between several project source files. You request the use of aheader file in your project source file (C, C++, etc) located in `src` folderby including it, with the C preprocessing directive `#include'.```src/main.c#include "header.h"int main (void){ ...}```Including a header file produces the same results as copying the header fileinto each source file that needs it. Such copying would be time-consumingand error-prone. With a header file, the related declarations appearin only one place. If they need to be changed, they can be changed in oneplace, and programs that include the header file will automatically use thenew version when next recompiled. The header file eliminates the labor offinding and changing all the copies as well as the risk that a failure tofind one copy will result in inconsistencies within a program.In C, the usual convention is to give header files names that end with `.h'.It is most portable to use only letters, digits, dashes, and underscores inheader file names, and at most one dot.Read more about using header files in official GCC documentation:* Include Syntax* Include Operation* Once-Only Headers* Computed Includeshttps://gcc.gnu.org/onlinedocs/cpp/Header-Files.html