Convert service classes to Kotlin

app/src/main/java/ai/elimu/content_provider/rest/ImagesService.kt

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+package ai.elimu.content_provider.rest
+
+import ai.elimu.model.v2.gson.content.ImageGson
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface ImagesService {
+    @GET("content/images")
+    fun listImages(): Call<List<ImageGson>>
+}

app/src/main/java/ai/elimu/content_provider/rest/LettersService.kt

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+package ai.elimu.content_provider.rest
+
+import ai.elimu.model.v2.gson.content.LetterGson
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface LettersService {
+    @GET("content/letters")
+    fun listLetters(): Call<List<LetterGson>>
+}

app/src/main/java/ai/elimu/content_provider/rest/NumbersService.kt

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+package ai.elimu.content_provider.rest
+
+import ai.elimu.model.v2.gson.content.NumberGson
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface NumbersService {
+    @GET("content/numbers")
+    fun listNumbers(): Call<List<NumberGson>>
+}

app/src/main/java/ai/elimu/content_provider/rest/SoundsService.kt

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+package ai.elimu.content_provider.rest
+
+import ai.elimu.model.v2.gson.content.SoundGson
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface SoundsService {
+    @GET("content/sounds")
+    fun listSounds(): Call<List<SoundGson>>
+}

app/src/main/java/ai/elimu/content_provider/rest/StoryBooksService.kt

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+package ai.elimu.content_provider.rest
+
+import ai.elimu.model.v2.gson.content.StoryBookGson
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface StoryBooksService {
+    @GET("content/storybooks")
+    fun listStoryBooks(): Call<List<StoryBookGson>>
+}

app/src/main/java/ai/elimu/content_provider/rest/VideosService.kt

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+package ai.elimu.content_provider.rest
+
+import ai.elimu.model.v2.gson.content.VideoGson
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface VideosService {
+    @GET("content/videos")
+    fun listVideos(): Call<List<VideoGson>>
+}