diff --git a/changelog_generator.rb b/changelog_generator.rb
index 7fd8ac3..d18ba78 100755
--- a/changelog_generator.rb
+++ b/changelog_generator.rb
@@ -1,85 +1,16 @@
 #!/usr/bin/env ruby
 # encoding: UTF-8
 
-require 'github_api'
-require 'json'
-require_relative 'constants'
+require_relative 'log_generator'
 
-def print_json(json)
-  puts JSON.pretty_generate(json)
-end
+generator = LogGenerator.new
 
-def exec_command(cmd)
-  %x[cd #{@project_path} && #{cmd}]
-end
-
-def findPrevTagDate
-
-  value1 = exec_command "git log --tags --simplify-by-decoration --pretty=\"format:%ci %d\" | grep tag"
-  unless value1
-    puts 'not found this tag'
-    exit
-  end
-
-  scan_results = value1.scan(/.*tag.*/)
-
-  prev_tag = scan_results[1]
-
-  unless scan_results.count
-    puts 'Not found any versions'
-    exit
-  end
-
-  puts "Prev tag is #{prev_tag}"
-
-  time = Time.parse(prev_tag)
-end
-
-
-def getAllClosedPullRequests
-
-  if @oauth_token
-    github = Github.new oauth_token: @oauth_token
-  else
-    github = Github.new
-  end
-    issues = github.pull_requests.list @github_user, @github_repo_name, :state => 'closed'
-    json = issues.body
-
-    json.each { |dict|
-      # print_json dict
-      # puts "##{dict[:number]} - #{dict[:title]} (#{dict[:closed_at]})"
-    }
-
-    json
-
-end
-
-def compund_changelog(tag_time, pull_requests)
-  log = ''
-  last_tag = exec_command('git describe --abbrev=0 --tags').strip
-  log += "## [#{last_tag}] (https://github.com/#{@github_user}/#{@github_repo_name}/tree/#{last_tag})\n"
-
-  time_string = tag_time.strftime "%Y/%m/%d"
-  log += "#### #{time_string}\n"
-
-  pull_requests.each { |dict|
-    merge = "#{dict[:title]} ([\\##{dict[:number]}](https://github.com/#{@github_user}/#{@github_repo_name}/pull/#{dict[:number]}))\n"
-    log += "- #{merge}"
-  }
-
-  puts log
-  File.open('output.txt', 'w') { |file| file.write(log) }
-
-end
-
-tag_time = findPrevTagDate
-
-pull_requests = getAllClosedPullRequests
+tag_time = generator.findPrevTagDate
+pull_requests = generator.getAllClosedPullRequests
 
 pull_requests.delete_if { |req|
   t = Time.parse(req[:closed_at]).utc
   t < tag_time
 }
 
-compund_changelog tag_time, pull_requests
\ No newline at end of file
+generator.compund_changelog(tag_time, pull_requests)
\ No newline at end of file
diff --git a/log_generator.rb b/log_generator.rb
index 1607f25..cdbb7d7 100644
--- a/log_generator.rb
+++ b/log_generator.rb
@@ -1,3 +1,76 @@
+require_relative 'constants'
+require 'github_api'
+require 'json'
+
 class LogGenerator
 
+  def print_json(json)
+    puts JSON.pretty_generate(json)
+  end
+
+  def exec_command(cmd)
+    exec_cmd = "cd #{$project_path} && #{cmd}"
+    %x[#{exec_cmd}]
+  end
+
+  def findPrevTagDate
+
+    value1 = exec_command "git log --tags --simplify-by-decoration --pretty=\"format:%ci %d\" | grep tag"
+    unless value1
+      puts 'not found this tag'
+      exit
+    end
+
+    scan_results = value1.scan(/.*tag.*/)
+
+    prev_tag = scan_results[1]
+
+    unless scan_results.any?
+      puts 'Not found any versions -> exit'
+      exit
+    end
+
+    puts "Prev tag is #{prev_tag}"
+
+    time = Time.parse(prev_tag)
+  end
+
+
+  def getAllClosedPullRequests
+
+    if $oauth_token
+      github = Github.new oauth_token: $oauth_token
+    else
+      github = Github.new
+    end
+    issues = github.pull_requests.list $github_user, $github_repo_name, :state => 'closed'
+    json = issues.body
+
+    json.each { |dict|
+      # print_json dict
+      # puts "##{dict[:number]} - #{dict[:title]} (#{dict[:closed_at]})"
+    }
+
+    json
+
+  end
+
+  def compund_changelog(tag_time, pull_requests)
+    log = ''
+    last_tag = exec_command('git describe --abbrev=0 --tags').strip
+    log += "## [#{last_tag}] (https://github.com/#{$github_user}/#{$github_repo_name}/tree/#{last_tag})\n"
+
+    time_string = tag_time.strftime "%Y/%m/%d"
+    log += "#### #{time_string}\n"
+
+    pull_requests.each { |dict|
+      merge = "#{dict[:title]} ([\\##{dict[:number]}](https://github.com/#{$github_user}/#{$github_repo_name}/pull/#{dict[:number]}))\n"
+      log += "- #{merge}"
+    }
+
+    puts log
+    File.open('output.txt', 'w') { |file| file.write(log) }
+
+  end
+
 end
\ No newline at end of file