moved rune2int and int2rune to utils package

utils/runeint.go

@@ -0,0 +1,19 @@
+package utils
+
+// RuneToInt converts a rune between '0' and '9' to an integer between 0 and 9
+// If the rune is outside of this range -1 is returned.
+func RuneToInt(r rune) int {
+	if r >= '0' && r <= '9' {
+		return int(r - '0')
+	}
+	return -1
+}
+
+// IntToRune converts a digit 0 - 9 to the rune '0' - '9'. If the given int is outside
+// of this range 'F' is returned!
+func IntToRune(i int) rune {
+	if i >= 0 && i <= 9 {
+		return rune(i + '0')
+	}
+	return 'F'
+}

utils/runeint_test.go

@@ -0,0 +1,24 @@
+package utils
+
+import "testing"
+
+func Test_RuneToIntIntToRune(t *testing.T) {
+	if IntToRune(0) != '0' {
+		t.Errorf("failed IntToRune(0) returned %d", string(IntToRune(0)))
+	}
+	if IntToRune(9) != '9' {
+		t.Errorf("failed IntToRune(9) returned %d", IntToRune(9))
+	}
+	if IntToRune(10) != 'F' {
+		t.Errorf("failed IntToRune(10) returned %d", IntToRune(10))
+	}
+	if RuneToInt('0') != 0 {
+		t.Error("failed RuneToInt('0') returned %d", RuneToInt(0))
+	}
+	if RuneToInt('9') != 9 {
+		t.Error("failed RuneToInt('9') returned %d", RuneToInt(9))
+	}
+	if RuneToInt('F') != -1 {
+		t.Error("failed RuneToInt('F') returned %d", RuneToInt('F'))
+	}
+}