remove unused helpers from barcode utility

-import 'dart:math' as math;
-
 import 'package:flutter/material.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 
@@ -55,175 +53,3 @@ BarcodeFormat toFormat(int value) {
       return BarcodeFormat.unknown;
   }
 }
-
-CalendarEvent? toCalendarEvent(Map? data) {
-  if (data != null) {
-    return CalendarEvent.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-DateTime? toDateTime(Map<String, dynamic>? data) {
-  if (data != null) {
-    final year = data['year'] as int;
-    final month = data['month'] as int;
-    final day = data['day'] as int;
-    final hour = data['hours'] as int;
-    final minute = data['minutes'] as int;
-    final second = data['seconds'] as int;
-    return data['isUtc'] as bool
-        ? DateTime.utc(year, month, day, hour, minute, second)
-        : DateTime(year, month, day, hour, minute, second);
-  } else {
-    return null;
-  }
-}
-
-ContactInfo? toContactInfo(Map? data) {
-  if (data != null) {
-    return ContactInfo.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-PersonName? toName(Map? data) {
-  if (data != null) {
-    return PersonName.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-DriverLicense? toDriverLicense(Map? data) {
-  if (data != null) {
-    return DriverLicense.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-Email? toEmail(Map? data) {
-  if (data != null) {
-    return Email.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-GeoPoint? toGeoPoint(Map? data) {
-  if (data != null) {
-    return GeoPoint.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-Phone? toPhone(Map? data) {
-  if (data != null) {
-    return Phone.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-SMS? toSMS(Map? data) {
-  if (data != null) {
-    return SMS.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-UrlBookmark? toUrl(Map? data) {
-  if (data != null) {
-    return UrlBookmark.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-WiFi? toWiFi(Map? data) {
-  if (data != null) {
-    return WiFi.fromNative(data);
-  } else {
-    return null;
-  }
-}
-
-Size applyBoxFit(BoxFit fit, Size input, Size output) {
-  if (input.height <= 0.0 ||
-      input.width <= 0.0 ||
-      output.height <= 0.0 ||
-      output.width <= 0.0) {
-    return Size.zero;
-  }
-
-  Size destination;
-
-  final inputAspectRatio = input.width / input.height;
-  final outputAspectRatio = output.width / output.height;
-
-  switch (fit) {
-    case BoxFit.fill:
-      destination = output;
-      break;
-    case BoxFit.contain:
-      if (outputAspectRatio > inputAspectRatio) {
-        destination = Size(
-          input.width * output.height / input.height,
-          output.height,
-        );
-      } else {
-        destination = Size(
-          output.width,
-          input.height * output.width / input.width,
-        );
-      }
-      break;
-
-    case BoxFit.cover:
-      if (outputAspectRatio > inputAspectRatio) {
-        destination = Size(
-          output.width,
-          input.height * (output.width / input.width),
-        );
-      } else {
-        destination = Size(
-          input.width * (output.height / input.height),
-          output.height,
-        );
-      }
-      break;
-    case BoxFit.fitWidth:
-      destination = Size(
-        output.width,
-        input.height * (output.width / input.width),
-      );
-      break;
-    case BoxFit.fitHeight:
-      destination = Size(
-        input.width * (output.height / input.height),
-        output.height,
-      );
-      break;
-    case BoxFit.none:
-      destination = Size(
-        math.min(input.width, output.width),
-        math.min(input.height, output.height),
-      );
-      break;
-    case BoxFit.scaleDown:
-      destination = input;
-      if (destination.height > output.height) {
-        destination = Size(output.height * inputAspectRatio, output.height);
-      }
-      if (destination.width > output.width) {
-        destination = Size(output.width, output.width / inputAspectRatio);
-      }
-      break;
-  }
-
-  return destination;
-}