hello to you too!

non_builtin_types.c

#include <stdio.h>

struct hello {
    int hello;
};

typedef struct hello hello;

hello* buffalo(hello* hello) {
    hello->hello = 5;
    return hello;
}

int main() {
    hello* hey;
    hello hello;
    hello.hello = 4;
    hey = buffalo(&hello);
    printf("greeting num %i\n", hey->hello);
    return 0;
}

hello buffalo. ^^