Solve issue #52 by improving url handling in SseClientTransport

Author: AbdullatifGhajar

src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/client/SSEClientTransport.kt

@@ -39,7 +39,7 @@ public class SseClientTransport(
     private var job: Job? = null
 
     private val baseUrl by lazy {
-        session.call.request.url.toString().removeSuffix("/")
+        session.call.request.url.toString().removeSuffix("/sse")
     }
 
     override suspend fun start() {
@@ -52,7 +52,7 @@ public class SseClientTransport(
 
         session = urlString?.let {
             client.sseSession(
-                urlString = it,
+                urlString = "$it/sse",
                 reconnectionTime = reconnectionTime,
                 block = requestBuilder,
             )
@@ -76,7 +76,7 @@ public class SseClientTransport(
 
                     "endpoint" -> {
                         try {
-                            val eventData = event.data ?: ""
+                            val eventData = event.data?.removePrefix("/") ?: ""
 
                             // check url correctness
                             val maybeEndpoint = Url("$baseUrl/$eventData")