feat: Fix field name and java_outer_classname file option

Author: fnakhsan

src/main/kotlin/com/fnakhsan/toprotobufconverter/converter/parser/KotlinDataTypeParser.kt

@@ -63,7 +63,8 @@ class KotlinDataTypeParser : DataTypeParser {
                             .replace("java.lang.", ""), numericPref = numericPref
                     )
                 } else if (this.presentableText.contains("Map")) {
-                    val mapValue = this.presentableText.removePrefix("Map<").removeSuffix(">").replace(" ", "").split(",")
+                    val mapValue =
+                        this.presentableText.removePrefix("Map<").removeSuffix(">").replace(" ", "").split(",")
                     parseDataType(fieldTypeName = mapValue.first(), numericPref = numericPref)
                     val key = fieldType
                     parseDataType(fieldTypeName = mapValue.last(), numericPref = numericPref)
@@ -80,7 +81,10 @@ class KotlinDataTypeParser : DataTypeParser {
         if (fieldOptions.isNotEmpty()) {
             suffix.append(" [").append(fieldOptions.joinToString(", ")).append("]")
         }
-        return prefix.toString() + fieldType + " " + field.name + " = " + id.toString() + suffix.toString() + SEMICOLON
+        val lowerSnakeCaseFieldName = field.name.replace(Regex("([A-Z])")) {
+            "_${it.value.lowercase()}"
+        }
+        return "$prefix$fieldType $lowerSnakeCaseFieldName = $id$suffix$SEMICOLON"
     }
 
     override fun parseDataType(fieldTypeName: String, numericPref: NumericPreferencesVM): String {

src/main/kotlin/com/fnakhsan/toprotobufconverter/converter/processor/KotlinToProtobufProcessor.kt

@@ -24,6 +24,7 @@ import com.fnakhsan.toprotobufconverter.core.models.VersionVW
 import com.intellij.psi.PsiField
 import org.jetbrains.kotlin.idea.testIntegration.framework.KotlinPsiBasedTestFramework.Companion.asKtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.util.capitalizeDecapitalize.capitalizeAsciiOnly
 
 class KotlinToProtobufProcessor(private val projectModel: ProjectModel, private val conversionModel: ConversionModel) :
     ProtobufTemplateHelper {
@@ -55,7 +56,10 @@ class KotlinToProtobufProcessor(private val projectModel: ProjectModel, private
     override fun getFileOption(): String = StringBuilder().apply {
         append(String.format(JAVA_PACKAGE, projectModel.packageName?.replace("/", ".")))
         append(String.format(JAVA_MULTIPLE_FILE, true))
-        append(String.format(JAVA_OUTER_CLASSNAME, projectModel.virtualFile.nameWithoutExtension))
+        append(
+            String.format(JAVA_OUTER_CLASSNAME,
+                conversionModel.rootFileName.split("_").joinToString("") { it.capitalizeAsciiOnly() })
+        )
     }.toString()
 
     override fun getMessage(name: String, body: String): String =