Add swiftlint and fix warnings

.gitignore

@@ -28,3 +28,4 @@ xcshareddata/
 # Swift Package Manager
 .build/
 Package.resolved*
+lintOutput.json

Package.swift

@@ -10,7 +10,7 @@ let package = Package(
     products: [
         .library(
             name: "Utils",
-            targets: ["Utils"]),
+            targets: ["Utils"])
     ],
     dependencies: [
     ],

UtilsExample/UtilsExample.xcodeproj/project.pbxproj

@@ -94,6 +94,7 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 948BE0A828ABA1CC00A3D10F /* Build configuration list for PBXNativeTarget "UtilsExample" */;
 			buildPhases = (
+				94B5554428ABE74B000DEFEF /* Swiftlint */,
 				948BE09028ABA1CB00A3D10F /* Sources */,
 				948BE09128ABA1CB00A3D10F /* Frameworks */,
 				948BE09228ABA1CB00A3D10F /* Resources */,
@@ -158,6 +159,27 @@
 		};
 /* End PBXResourcesBuildPhase section */
 
+/* Begin PBXShellScriptBuildPhase section */
+		94B5554428ABE74B000DEFEF /* Swiftlint */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+			);
+			name = Swiftlint;
+			outputFileListPaths = (
+			);
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "export PATH=\"$PATH:/opt/homebrew/bin\"\n\nif which swiftlint >/dev/null; then\n  swiftlint --path .. --config ../swiftlint.yml\nelse\n  echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\"\nfi\n";
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
 		948BE09028ABA1CB00A3D10F /* Sources */ = {
 			isa = PBXSourcesBuildPhase;