Creating own library in C

To create your own library in C please follow this steps:

1. Create two folders, name the first folder 'utils' and the second folder 'headers'
2. Write your functions in a .c file and put it in the utils folder. 
3. Create a .h file with the same name as the .c file that contains the functions. Put the header files in the headers folder. The .h file should contains following code. 

	/*
	header for myFunctions.c
	*/
	#ifndef MYFUNCTIONS_H // check if there is already a header with this name.
	#define MYFUNCTIONS_H // if not, define one
	// list of functions we one to use from the myFunctions.c
	double firstFunction(double);
	int secondFunction(double, int);
	#endif

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4. Open terminal and go to the utils folder and compile the .c files using this command gcc -c *.c
5. Build the library by putting all the .o files in an archive using this command ar -cvq yourlibraryname.a *.o library name starts with lib, and don't froget the .a extension at the end
6. Now you can use the library in your program by adding a file header #include "headers/yourLibraryName.h"
7. Compile your program by providing the library name gcc -o programName programSourceCode.c utils/libraryName.a
8. If youre using C-Lion IDE, you can simply add your .c and .h paths to the CMakeList.txt like this:

	cmake_minimum_required(VERSION 3.8)
	project(Tutorial2)
	set(CMAKE_C_STANDARD 99)
	set(SOURCE_FILES main.c)
	#You have to add your .c and .h paths here.
	add_executable(Tutorial2 ${SOURCE_FILES} utils/add.c headers/add.h)

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