refactor: improve URL formatting and validation logic in CmabClient and CmabConfig

Author: muzahidul-opti

Sources/CMAB/CmabClient.swift

@@ -101,7 +101,7 @@ class DefaultCmabClient: CmabClient {
     }
 
     func getUrl(ruleId: String) -> URL? {
-        let urlString = "\(predictionEndpoint)/\(ruleId)"
+        let urlString = predictionEndpoint.hasSuffix("/") ? "predictionEndpoint\(ruleId)" : "\(predictionEndpoint)/\(ruleId)"
         guard let url = URL(string: urlString) else {
             self.logger.e("Invalid CMAB endpoint")
             return nil

Sources/CMAB/CmabConfig.swift

@@ -40,12 +40,7 @@ public struct CmabConfig {
         self.cacheSize = cacheSize
         self.cacheTimeoutInSecs = cacheTimeoutInSecs
         // Sanitize and validate endpoint
-        if let endpoint = predictionEndpoint?.trimmingCharacters(in: .whitespaces), !endpoint.isEmpty {
-            // Remove trailing slashes
-            var sanitized = endpoint
-            if sanitized.hasSuffix("/") {
-                sanitized = String(sanitized.dropLast())
-            }
+        if let sanitized = predictionEndpoint?.trimmingCharacters(in: .whitespaces), !sanitized.isEmpty {
             self.predictionEndpoint = sanitized
         } else {
             self.predictionEndpoint = CMAB_PREDICTION_END_POINT