Write a function that checks whether or not a given string is a valid IP address (in human-readable form, of course). This function should return 1 if the address is valid, and 0 if not. the function should check if there are 4 parts in the string, separated by dots, each part contains only digits, each number is in the range of 0 to 255. Separate the declaration of the function from its full definition. Write a second function that calls the first one and then prints an appropriate message: "127.0.0.1 is a valid IP address" or "a.b.c.d is not a valid IP address". Write a code to test it with values.

C using stdio.h