Add SwiftLint HARD rules

Sources/ResgenSwift/Fonts/FontsToolError.swift

@@ -8,27 +8,28 @@
 import Foundation
 
 enum FontsToolError: Error {
+
     case extensionNamesCollision(String)
     case fcScan(String, Int32, String?)
     case inputFolderNotFound(String)
     case fileNotExists(String)
     case writeExtension(String, String)
-    
+
     var description: String {
         switch self {
         case .extensionNamesCollision(let extensionName):
             return "error: [\(Fonts.toolName)] Error on extension names, extension name and SwiftUI extension name should be different (\(extensionName) is used on both)"
-            
-        case .fcScan(let path, let code, let output):
+
+        case let .fcScan(path, code, output):
             return "error: [\(Fonts.toolName)] Error while getting fontName (fc-scan --format %{postscriptname} \(path). fc-scan exit with \(code) and output is: \(output ?? "no output")"
-            
+
         case .inputFolderNotFound(let inputFolder):
             return "error: [\(Fonts.toolName)] Input folder not found: \(inputFolder)"
-            
+
         case .fileNotExists(let filename):
             return "error: [\(Fonts.toolName)] File \(filename) does not exists"
-            
-        case .writeExtension(let filename, let info):
+
+        case let .writeExtension(filename, info):
             return "error: [\(Fonts.toolName)] An error occured while writing extension in \(filename): \(info)"
         }
     }