fix: extract duplicated stripUndefined function to shared utility

Author: johanviberg

src/config/index.ts

@@ -237,7 +237,6 @@ export class ConfigManager {
   }
 }
 
-
 /**
  * Validate and merge ProxyCheck options
  */

src/services/check.ts

@@ -223,7 +223,6 @@ export class CheckService extends BaseService {
     }
   }
 
-
   /**
    * Add blocking logic for single address checks
    */

src/services/listing.ts

@@ -235,5 +235,4 @@ export class ListingService extends BaseService {
       throw new ProxyCheckValidationError("Invalid list options provided", "options", options);
     }
   }
-
 }

src/services/rules.ts

@@ -231,5 +231,4 @@ export class RulesService extends BaseService {
       throw new ProxyCheckValidationError("Invalid rule options provided", "options", options);
     }
   }
-
 }

src/services/stats.ts

@@ -211,5 +211,4 @@ export class StatsService extends BaseService {
       throw new ProxyCheckValidationError("Invalid stats options provided", "options", options);
     }
   }
-
 }

src/utils/object.ts

@@ -9,4 +9,4 @@ export function stripUndefined<T extends Record<string, unknown>>(obj: T): T {
     }
   }
   return result;
-}
+}