Simplified file structure

src/asm/Label.go

@@ -0,0 +1,21 @@
+package asm
+
+// Label represents a jump label.
+type Label struct {
+	Name string
+}
+
+// String returns a human readable version.
+func (data *Label) String() string {
+	return data.Name
+}
+
+// Label adds an instruction using a label.
+func (a *Assembler) Label(mnemonic Mnemonic, name string) {
+	a.Instructions = append(a.Instructions, Instruction{
+		Mnemonic: mnemonic,
+		Data: &Label{
+			Name: name,
+		},
+	})
+}