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