printf from C stdio.h can be called in Rust with using fk_std for FOMOS development or FOMOS app and command
development. Usually when you call printf in C you would do something like this:

    #include <stdio.h>

    printf("Hello world!\n");

In C you just call printf with text as an argument inside the quotes, in the FOMOS kernel you would do something very
different.

    use fk_std::{c_char, printf};

    let/const TEXT: &str = "Hello world!\n\0";
    unsafe { printf(TEXT.as_ptr() as *const c_char) }

Instead of calling printf with it's arguments in Rust. To call printf your text needs to be declared in a let or const
as a string, call printf as an unsafe function since it's not apart of Rust, add your text as an argument and the c_char
type.

Another example:

    extern crate fk_std;
    use fk_std::{printf};

    fn main() {
        const TEXT: &'static str = "Hello world from Rust printf!\n\0";
        unsafe { printf(TEXT.as_ptr() as *const _) }
    }


For now you will need to add \0 to your string until there is an easy way of adding \0 or \n\0 to your string when
printf is called.