fix(client): trim '/' and empty character in base URL (#424)

* trimmed base url

* spotless check

Author: mssfang

openai-java-core/src/main/kotlin/com/openai/core/Utils.kt

@@ -93,7 +93,9 @@ internal fun Any?.contentToString(): String {
 internal fun isAzureEndpoint(baseUrl: String): Boolean {
     // Azure Endpoint should be in the format of `https://<region>.openai.azure.com`.
     // Or `https://<region>.azure-api.net` for Azure OpenAI Management URL.
-    return baseUrl.endsWith(".openai.azure.com", true) || baseUrl.endsWith(".azure-api.net", true)
+    val trimmedBaseUrl = baseUrl.trim().trimEnd('/')
+    return trimmedBaseUrl.endsWith(".openai.azure.com", true) ||
+        trimmedBaseUrl.endsWith(".azure-api.net", true)
 }
 
 internal interface Enum

openai-java-core/src/test/kotlin/com/openai/core/UtilsTest.kt

@@ -30,4 +30,20 @@ internal class UtilsTest {
         assertThat(arrayOf(byteArrayOf(1, 2), byteArrayOf(3)).contentToString())
             .isEqualTo("[[1, 2], [3]]")
     }
+
+    @Test
+    fun isAzureEndpoint() {
+        // Valid Azure endpoints
+        assertThat(isAzureEndpoint("https://region.openai.azure.com")).isTrue()
+        assertThat(isAzureEndpoint("https://region.openai.azure.com/")).isTrue()
+        assertThat(isAzureEndpoint("https://region.azure-api.net")).isTrue()
+        assertThat(isAzureEndpoint("https://region.azure-api.net/")).isTrue()
+
+        // Invalid Azure endpoints
+        assertThat(isAzureEndpoint("https://example.com")).isFalse()
+        assertThat(isAzureEndpoint("https://region.openai.com")).isFalse()
+        assertThat(isAzureEndpoint("https://region.azure.com")).isFalse()
+        assertThat(isAzureEndpoint("")).isFalse()
+        assertThat(isAzureEndpoint("   ")).isFalse()
+    }
 }