Add code

.gitignore

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+# Files and directories created by pub
+.dart_tool/
+.packages
+
+# Omit commiting pubspec.lock for library packages:
+# https://dart.dev/guides/libraries/private-files#pubspeclock
+pubspec.lock
+
+# Conventional directory for build outputs
+build/
+
+# Directory created by dartdoc
+doc/api/

CHANGELOG.md

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+## 1.0.0
+
+- Initial version, created by Stagehand

LICENSE

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+MIT License
+
+Copyright (c) 2021 Oliver Ni
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Bottom
+
+This is a Dart implementation of [bottom](https://github.com/kaylynn234/bottom).
+
+Bottom encodes UTF-8 text into a sequence comprised of bottom emoji (`🫂✨🥺❤️`, with `,` sprinkled in for good measure) followed by `👉👈`. It can encode any valid UTF-8 — being a bottom transcends language, after all — and decode back into UTF-8.
+
+## Usage
+
+Here's a simple example:
+
+```dart
+import 'package:bottom/bottom.dart';
+
+void main(List<String> args) {
+  print(bottom.encode(args.join(' ')));
+}
+```

analysis_options.yaml

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+# Defines a default set of lint rules enforced for
+# projects at Google. For details and rationale,
+# see https://github.com/dart-lang/pedantic#enabled-lints.
+include: package:pedantic/analysis_options.yaml
+
+# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
+# Uncomment to specify additional rules.
+# linter:
+#   rules:
+#     - camel_case_types
+
+analyzer:
+#   exclude:
+#     - path/to/excluded/files/**

example/bottom_example.dart

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+import 'package:bottom/bottom.dart';
+
+void main(List<String> args) {
+  print(bottom.encode(args.join(' ')));
+}

lib/bottom.dart

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+library bottom;
+
+import 'dart:convert';
+
+Map<String, int> _charValues = {
+  '🫂': 200,
+  '💖': 50,
+  '✨': 10,
+  '🥺': 5,
+  ',': 1,
+};
+
+const _zero = '❤️';
+const _sectionSeparator = '👉👈';
+final _terminator = RegExp('$_sectionSeparator?\$');
+
+class BottomEncoder extends Converter<String, String> {
+  String _encodeByte(int value) {
+    if (value == 0) return '';
+    final largest =
+        _charValues.entries.firstWhere((entry) => value >= entry.value);
+    return largest.key + _encodeByte(value - largest.value);
+  }
+
+  String encodeByte(int value) {
+    return value == 0 ? _zero : _encodeByte(value);
+  }
+
+  @override
+  String convert(String input) {
+    return utf8
+        .encode(input)
+        .map((value) => encodeByte(value) + _sectionSeparator)
+        .join();
+  }
+}
+
+class BottomDecoder extends Converter<String, String> {
+  @override
+  String convert(String input) {
+    return utf8.decode(input
+        .trim()
+        .replaceAll(_terminator, '')
+        .split(_sectionSeparator)
+        .map((chars) => chars
+            .split('')
+            .map((x) => _charValues[x])
+            .reduce((a, b) => a + b)));
+  }
+}
+
+class BottomCodec extends Codec<String, String> {
+  @override
+  BottomEncoder get encoder => BottomEncoder();
+
+  @override
+  BottomDecoder get decoder => BottomDecoder();
+}
+
+final bottom = BottomCodec();

pubspec.yaml

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+name: bottom
+description: A starting point for Dart libraries or applications.
+version: 1.0.0
+homepage: https://github.com/oliver-ni/bottom-dart
+
+environment:
+  sdk: ">=2.8.1 <3.0.0"
+
+dev_dependencies:
+  pedantic: ^1.9.0
+  test: ^1.14.4

test/bottom_dart_test.dart

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+import 'package:bottom/bottom.dart';
+import 'package:test/test.dart';
+
+Map<String, String> pairs = {
+  'Test': '💖✨✨✨,,,,👉👈💖💖,👉👈💖💖✨🥺👉👈💖💖✨🥺,👉👈',
+  'Hello World':
+      '💖✨✨,,👉👈💖💖,👉👈💖💖🥺,,,👉👈💖💖🥺,,,👉👈💖💖✨,👉👈✨✨✨,,👉👈💖✨✨✨🥺,,👉👈💖💖✨,👉👈💖💖✨,,,,👉👈💖💖🥺,,,👉👈💖💖👉👈',
+  'がんばれ':
+      '🫂✨✨🥺,,👉👈💖💖✨✨🥺,,,,👉👈💖💖✨✨✨✨👉👈🫂✨✨🥺,,👉👈💖💖✨✨✨👉👈💖💖✨✨✨✨🥺,,👉👈🫂✨✨🥺,,👉👈💖💖✨✨🥺,,,,👉👈💖💖💖✨✨🥺,👉👈🫂✨✨🥺,,👉👈💖💖✨✨✨👉👈💖💖✨✨✨✨👉👈',
+  '🥺': '🫂✨✨✨✨👉👈💖💖💖🥺,,,,👉👈💖💖💖✨🥺👉👈💖💖💖✨✨✨🥺,👉👈',
+  '\x00': '❤️👉👈',
+};
+
+void main() {
+  group('Bottom tests', () {
+    test('Encodes properly', () {
+      pairs.forEach((text, result) => expect(bottom.encode(text), result));
+    });
+
+    test('Decodes properly', () {
+      pairs.forEach((text, result) => expect(bottom.decode(result), text));
+    });
+  });
+}