how to create a library in c

The below is sample project where string functions are kept in a library.

Read Me:
 Coded By:
                Name:Vaneeswaran N
                www.vaneeswaran.com
 Description : 
  Sample project to demonstrate how to write a C library , build as a shared library and use it 
       
Files :
main.c   - Invokes the functions from the shared library
vanees.h  - Defines the functions used in  the shared library
vanees_string.c - Has the implementation of the functions that are used in the shared library
gen_lib.sh   - This script will compile all files and create a shared library

GitHub Link to download :

https://github.com/vaneeswaran/my_c_codes/tree/master/How_to_create_a_C_library