Ensure version files are created at same path as store

Addresses #99

kstore-file/src/commonMain/kotlin/io/github/xxfast/kstore/file/extensions/KVersionedStore.kt

@@ -1,7 +1,7 @@
 package io.github.xxfast.kstore.file.extensions
 
-import io.github.xxfast.kstore.KStore
 import io.github.xxfast.kstore.Codec
+import io.github.xxfast.kstore.KStore
 import io.github.xxfast.kstore.file.utils.FILE_SYSTEM
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.KSerializer
@@ -16,15 +16,14 @@ import okio.Path
 import okio.Path.Companion.toPath
 import okio.buffer
 import okio.use
-
 import kotlinx.serialization.json.okio.decodeFromBufferedSource as decode
 import kotlinx.serialization.json.okio.encodeToBufferedSink as encode
 
 /**
  * Creates a store with a versioned encoder and decoder
  * Note: An additional file will be written to manage metadata on the same path with `.version` suffix
  *
- * @param filePath path to the file that is managed by this store
+ * @param file path to the file that is managed by this store
  * @param default returns this value if the file is not found. defaults to null
  * @param enableCache maintain a cache. If set to false, it always reads from disk
  * @param json Serializer to use. Defaults serializer ignores unknown keys and encodes the defaults
@@ -38,9 +37,10 @@ public inline fun <reified T : @Serializable Any> storeOf(
   default: T? = null,
   enableCache: Boolean = true,
   json: Json = Json { ignoreUnknownKeys = true; encodeDefaults = true },
+  versionPath: Path = "$file.version".toPath(), // TODO: Save to file metadata instead
   noinline migration: Migration<T> = DefaultMigration(default),
 ): KStore<T> {
-  val codec: Codec<T> = VersionedCodec(file, version, json, json.serializersModule.serializer(), migration)
+  val codec: Codec<T> = VersionedCodec(file, version, json, json.serializersModule.serializer(), migration, versionPath)
   return KStore(default, enableCache, codec)
 }
 
@@ -50,14 +50,14 @@ public fun <T> DefaultMigration(default: T?): Migration<T> = { _, _ -> default }
 public typealias Migration<T> = (version: Int?, JsonElement?) -> T?
 
 @OptIn(ExperimentalSerializationApi::class)
-public class VersionedCodec<T: @Serializable Any>(
+public class VersionedCodec<T : @Serializable Any>(
   private val file: Path,
   private val version: Int = 0,
   private val json: Json,
   private val serializer: KSerializer<T>,
   private val migration: Migration<T>,
-): Codec<T> {
-  private val versionPath: Path = "$${file.name}.version".toPath() // TODO: Save to file metadata instead
+  private val versionPath: Path = "$file.version".toPath(), // TODO: Save to file metadata instead
+) : Codec<T> {
 
   override suspend fun decode(): T? =
     try {