Re-organize utilities based on category

lib/utils/text_utils.dart

@@ -0,0 +1,36 @@
+String humanizeDuration(Duration? duration) {
+  if (duration == null) {
+    return "";
+  }
+  if (duration.inMinutes >= 1) {
+    var min = duration.inMinutes;
+    var secs = duration.inSeconds.remainder(60);
+    return "$min.$secs m";
+  }
+  if (duration.inSeconds >= 1) {
+    var secs = duration.inSeconds;
+    var mili = duration.inMilliseconds.remainder(1000) ~/ 10;
+    return "$secs.$mili s";
+  } else {
+    var mili = duration.inMilliseconds.remainder(1000);
+    return "$mili ms";
+  }
+}
+
+String capitalizeFirstLetter(String? text) {
+  if (text == null || text == "") {
+    return "";
+  } else if (text.length == 1) {
+    return text.toUpperCase();
+  } else {
+    var first = text[0];
+    var rest = text.substring(1);
+    return first.toUpperCase() + rest;
+  }
+}
+
+String formatHeaderCase(String text) {
+  var sp = text.split("-");
+  sp = sp.map((e) => capitalizeFirstLetter(e)).toList();
+  return sp.join("-");
+}