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Get relative path (2)

namespace RSBuild {     using System.Text;     /// <summary>   /// Utility methods.   /// </summary>   public static class PathUtil   {         /// <summary>         /// Formats the path.         /// </summary>         /// <param name="input">The input.</param>         /// <returns></returns>     public static string FormatPath(string input)     {             const char DIR_SEPARATOR = '/';             input = input == null                 ? string.Empty                 : input.Trim();             if (input.Length == 0) return DIR_SEPARATOR.ToString();             StringBuilder sb = new StringBuilder(input).Replace('\\', DIR_SEPARATOR);             if (sb[sb.Length - 1] == DIR_SEPARATOR)             {                 sb.Length -= 1;             }             if (sb[0] != DIR_SEPARATOR)             {                 sb.Insert(0, DIR_SEPARATOR);             }             return sb.ToString();     }         /// <summary>         /// Gets the relative path.         /// </summary>         /// <param name="source">The source.</param>         /// <param name="target">The target.</param>         /// <returns></returns>     public static string GetRelativePath(string source, string target)     {       string pathSource = PathUtil.FormatPath(source);       string pathTarget = PathUtil.FormatPath(target);       string[] sourceSegments = null;       string[] targetSegments = null;             int sourceToCommonRoot = 0;             int targetToCommonRoot = 0;                    if (pathSource != "/")       {         sourceSegments = pathSource.Split('/');         sourceToCommonRoot = sourceSegments.GetUpperBound(0);       }       if (pathTarget != "/")       {         targetSegments = pathTarget.Split('/');         targetToCommonRoot = targetSegments.GetUpperBound(0);       }                    StringBuilder relativePath = new StringBuilder();       int parentSegments = sourceToCommonRoot;       int i = 1;       while(sourceToCommonRoot >= i && targetToCommonRoot >= i)       {         if (string.Compare(sourceSegments[i], targetSegments[i], true) == 0)         {           parentSegments--;           i++;         }         else         {           break;         }       }       for(int k=0; k<parentSegments; k++)       {         relativePath.Append("../");       }       for(int m=i; m<=targetToCommonRoot; m++)       {         relativePath.AppendFormat("{0}/", targetSegments[m]);       }       return relativePath.ToString();     }   } }