Fix baseUrl must end in / crash

app/src/main/java/de/lukasneugebauer/nextcloudcookbook/core/util/StringAddSuffixExtension.kt

@@ -0,0 +1,8 @@
+package de.lukasneugebauer.nextcloudcookbook.core.util
+
+fun String.addSuffix(suffix: String, ignoreEmpty: Boolean = true): String {
+    if ((this.isEmpty() && ignoreEmpty) || this.endsWith(suffix)) {
+        return this
+    }
+    return "$this$suffix"
+}

app/src/main/java/de/lukasneugebauer/nextcloudcookbook/di/ApiProvider.kt

@@ -7,6 +7,7 @@ import de.lukasneugebauer.nextcloudcookbook.core.data.api.NcCookbookApi
 import de.lukasneugebauer.nextcloudcookbook.core.data.remote.BasicAuthInterceptor
 import de.lukasneugebauer.nextcloudcookbook.core.data.remote.NetworkInterceptor
 import de.lukasneugebauer.nextcloudcookbook.core.domain.model.NcAccount
+import de.lukasneugebauer.nextcloudcookbook.core.util.addSuffix
 import de.lukasneugebauer.nextcloudcookbook.recipe.data.dto.NutritionDto
 import de.lukasneugebauer.nextcloudcookbook.recipe.data.remote.deserializer.NutritionDeserializer
 import kotlinx.coroutines.CoroutineScope
@@ -69,7 +70,7 @@ class ApiProvider @Inject constructor(
             .build()
 
         val retrofit = Retrofit.Builder()
-            .baseUrl(ncAccount.url)
+            .baseUrl(ncAccount.url.addSuffix("/"))
             .client(client)
             .addConverterFactory(GsonConverterFactory.create(gson))
             .addCallAdapterFactory(NetworkResponseAdapterFactory())

app/src/test/java/de/lukasneugebauer/nextcloudcookbook/StringAddSuffixUnitTest.kt

@@ -0,0 +1,19 @@
+package de.lukasneugebauer.nextcloudcookbook
+
+import de.lukasneugebauer.nextcloudcookbook.core.util.addSuffix
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class StringAddSuffixUnitTest {
+    @Test
+    fun string_AddSlashAsSuffix_ReturnsString() {
+        val string = "https://cloud.example.tld".addSuffix("/")
+        assertEquals("https://cloud.example.tld/", string)
+    }
+
+    @Test
+    fun string_AddNoSuffix_ReturnsString() {
+        val string = "https://cloud.example.tld/".addSuffix("/")
+        assertEquals("https://cloud.example.tld/", string)
+    }
+}