This method computes the final tree hash used on the CompleteMultipartUploadRequest from the tree hashes of
            the individual part uploaded.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public static string CalculateTreeHash( IEnumerable<string> partsTreeHash )
 Parameters
 Parameters- partsTreeHash (IEnumerable<(Of <(<'String>)>)>)
- The list of tree hashes for the individual parts.
 Return Value
 Return ValueThe tree hash that can be used to set the the Checksum property.