Improved file structure

src/arch/x64/Return.go

@@ -0,0 +1,7 @@
+package x64
+
+// Return transfers program control to a return address located on the top of the stack.
+// The address is usually placed on the stack by a Call instruction.
+func Return(code []byte) []byte {
+	return append(code, 0xc3)
+}