♻️ Refactor classes to avoid big ones

Fix #20

src/util.py

@@ -0,0 +1,24 @@
+class Util:
+    @staticmethod
+    def format_seconds(seconds):
+        hours = None
+        minutes = seconds / 60
+        if minutes >= 1:
+            if minutes >= 60:
+                hours = int(minutes / 60)
+                minutes = int(minutes % 60)
+            else:
+                minutes = int(minutes)
+            seconds = seconds % 60
+        else:
+            minutes = None
+
+        time = ""
+        if hours is not None and hours != 0:
+            time += str(hours) + "h"
+        if minutes is not None and minutes != 0:
+            time += str(minutes) + "m"
+        if seconds is not None and seconds != 0:
+            time += str(seconds) + "s"
+
+        return time