Hey you may organise all your API Url's by using the following code
#define SITE_URL(url) @"http://192.168.100.100/api" url
#define LOGIN_URL SITE_URL("/login")
#define SIGNUP_URL SITE_URL("/signup")
#define PRODUCTS_URL SITE_URL("/products")
#define EMPLOYEE_URL SITE_URL("/employee")
#define GET_PRODUCTS_URL SITE_URL("/getproducts")
#define CLIENTS_URL SITE_URL("/clients")