fix: sonarqube issue by using built-in URL type (#11)

* fix: sonarqube issue by using built-in URL type

* resolve "Remove this hard-coded path-delimiter." issue

Author: mattinannt

Sources/FormbricksSDK/Helpers/FormbricksEnvironment.swift

@@ -2,7 +2,7 @@ import Foundation
 
 internal enum FormbricksEnvironment {
 
-  /// Only `appUrl` is user-supplied. Crash early if it’s missing.
+  /// Only `appUrl` is user-supplied. Crash early if it's missing.
   fileprivate static var baseApiUrl: String {
     guard let url = Formbricks.appUrl else {
       fatalError("Formbricks.setup must be called before using the SDK.")
@@ -12,21 +12,22 @@ internal enum FormbricksEnvironment {
 
   /// Returns the full survey‐script URL as a String
   static var surveyScriptUrlString: String {
-    let path = "/" + ["js", "surveys.umd.cjs"].joined(separator: "/") // NOSONAR we can hard-code "/" here
-    return baseApiUrl + path
+    guard let baseURL = URL(string: baseApiUrl) else {
+      fatalError("Invalid base URL: \(baseApiUrl)")
+    }
+    
+    // Append path components properly using URL
+    let surveyScriptURL = baseURL.appendingPathComponent("js").appendingPathComponent("surveys.umd.cjs")
+    return surveyScriptURL.absoluteString
   }
 
   /// Returns the full environment‐fetch URL as a String for the given ID
-    static var getEnvironmentRequestEndpoint: String {
-      let path = "/" + ["api", "v2", "client", "{environmentId}", "environment"] // NOSONAR we can hard-code "/" here
-      .joined(separator: "/")
-    return path
+  static var getEnvironmentRequestEndpoint: String {
+    return ["api", "v2", "client", "{environmentId}", "environment"].joined(separator: "/")
   }
 
   /// Returns the full post-user URL as a String for the given ID
-    static var postUserRequestEndpoint: String {
-    let path = "/" + ["api", "v2", "client", "{environmentId}", "user"] // NOSONAR we can hard-code "/" here
-      .joined(separator: "/")
-    return path
+  static var postUserRequestEndpoint: String {
+    return ["api", "v2", "client", "{environmentId}", "user"].joined(separator: "/")
   }
 }