Unity Editor Script to make items in line

MakeItemsLine.cs

using System.IO;
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;

public class MakeItemsLine : EditorWindow
{
    private Vector3 m_startPos;
	private float m_unitLength;


	[MenuItem("GameEditor/make items line")]
	public static void ShowWindow()
	{
        EditorWindow.GetWindow(typeof(MakeItemsLine));
	}
	
	void OnGUI()
	{
		EditorGUILayout.BeginVertical();
        m_startPos = EditorGUILayout.Vector3Field("start pos", m_startPos);
        m_unitLength = EditorGUILayout.FloatField("unit length ", m_unitLength);

		EditorGUILayout.Space();
		if (GUILayout.Button("make selections along - Line", GUILayout.Height(20)))
		{
			makeLine(Selection.gameObjects);
		}

        if (GUILayout.Button("make selections along | Line", GUILayout.Height(20)))
        {
            makeVLine(Selection.gameObjects);
        }

        if (GUILayout.Button("set Start Position", GUILayout.Height(20)))
        {
            setStartPos(Selection.gameObjects);
        }

        if (GUILayout.Button("set Unit Length", GUILayout.Height(20)))
        {
            setUnitLength(Selection.gameObjects);
        }
		
		EditorGUILayout.EndVertical();
	}

    void makeLine(GameObject[] gameObjcects)
	{
		int count = gameObjcects.Length;
        Vector3 pos = Vector3.zero;
		for (int i = 0; i < count; i++)
		{
			GameObject obj = gameObjcects[i];
            pos.x = m_unitLength * i;
            
			obj.transform.localPosition = pos + m_startPos;
		}
	}

    void makeVLine(GameObject[] gameObjcects)
    {
        int count = gameObjcects.Length;
        Vector3 pos = Vector3.zero;
        for (int i = 0; i < count; i++)
        {
            GameObject obj = gameObjcects[i];
            pos.y = m_unitLength * i;

            obj.transform.localPosition = pos + m_startPos;
        }
    }

    void setStartPos(GameObject[] gameObjcects)
    {
        int count = gameObjcects.Length;
        Vector3 minXPos = Vector3.zero;

        if (count > 0)
            minXPos = gameObjcects[0].transform.localPosition;

        for (int i = 0; i < count; i++)
        {
            GameObject obj = gameObjcects[i];
            if(obj.transform.localPosition.x < minXPos.x)
                minXPos = gameObjcects[i].transform.localPosition;
        }

        m_startPos = minXPos;
    }

    void setUnitLength(GameObject[] gameObjcects)
    {
        int count = gameObjcects.Length;
        if (count == 2)
        {
            m_unitLength = Mathf.Abs(gameObjcects[1].transform.localPosition.x - gameObjcects[0].transform.localPosition.x);
        }
    }
}