Implement release type calculation

services.py

@@ -1,26 +1,24 @@
 from version_repository import VersionRepository
 from release_type import ReleaseType
+from git_repository import GitRepository
 
 class InitReleaseService():
 
     def __init__(self, commit_id, file):
         self.commit_id = commit_id
         self.file = file
-        self.version_repo = None
-
-    def __read_commit_message(self):
-        pass
+        self.version_repo = None        
 
     def __calculate_release_type(self):
-        pass
-
+        return GitRepository().get_release_type_from_latest_commit()
+        
     def get_version(self, release_type):
         self.version_repo = VersionRepository(self.file)
         return self.version_repo.get_version(release_type)
 
     def create_release_version(self):
         commit_message = self.read_commit_message(self.commit_id)
-        release_type = self.calculate_release_type(commit_message)
+        release_type = self.__calculate_release_type(commit_message)
         version = self.get_version(release_type).create_release_version()
         
         self.version_repo.write_file(version.get_version_string())