Added uptime functionality

internal/uptime/uptime.go

@@ -0,0 +1,41 @@
+package uptime
+
+import (
+	"fmt"
+	"math"
+)
+
+type UptimeInformation struct {
+	uptime float64
+}
+
+func (uptimeInfo UptimeInformation) GetUptime() (seconds float64) {
+	return uptimeInfo.uptime
+}
+
+func (uptimeInfo UptimeInformation) FormatSeconds() string {
+	total := int64(math.Round(uptimeInfo.uptime))
+
+	if total < 60 {
+		return fmt.Sprintf("%d", total)
+	}
+	s := total % 60
+	m := (total / 60) % 60
+
+	if total < 3600 {
+		// e.g., 5:03
+		return fmt.Sprintf("%d:%02d", m, s)
+	}
+
+	h := (total / 3600) % 24
+
+	if total < 86400 {
+		// e.g., 2:05:03
+		return fmt.Sprintf("%d:%02d:%02d", h, m, s)
+	}
+
+	d := total / 86400
+
+	// e.g., 1:02:05:03
+	return fmt.Sprintf("%d:%02d:%02d:%02d", d, h, m, s)
+}