str hello = "hello World!";
str msg = " damage inflicted!";

if (msg[1] == 'd') {
    print("yes");
}

pln(msg.length as str);
pln(msg);
hello[0] = hello[0] - ' ';
pln(hello);
halt;

function pln(str string) {
    nat i = 0;
    while (i < string.length) {
        write = string[i];
        i = i + 1;
    }
    write = '\n';
}