assembler copy char[]

[nobody]

Hello,

i try copy mystring to st in assembler. 
Can someone give me an advice how to do this.

import std.stdio;
void main()
{
        char[] mystring = "Hey Assembler\n";
        char[] st;

        asm
        {
                mov EAX, dword ptr [mystring+4];
                mov st,EAX;
        }
        writefln("st: ", st);
}

I get a Segmentation fault .

Thanks