tsql - T-SQL update with switch-case statement -

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I want to implement this pseudo in T-SQL 

  UPDATE processing SET [ Path] = case ([path]. Substrings ([path]. Let index ('.'))) WHEN '.jpg' THEN '/image.jpg' WHEN '.png' THEN '/image.jpg' WHEN ' . AVG 'THEN' / Video.jpg 'WHEN' .mkv 'THEN' /video.jpg '  
 For this I use this solution  
  UPDATE RESOURCES SET [path] = CASE (SUBSTRING ([path], LAN ([path]) - Cherrindx ('.', Reverse ([path])) + 1, 3) WHEN '.jpg' THEN '/ image .jpg 'WHEN' .png 'THEN' /image.jpg 'WHEN' .avi 'THEN' /video.jpg 'WHEN' .mkv 'THEN' /video.jpg 'END   
 But it is  
   
 
 
 Try it instead:  
  SUBSTRING (path, LAN (path) - chordix ('.', Reverse (path)) + 1, LAN (path)   
 ( LEN ( Path)  as the length of reading; OK If it allows for ND and N-character extensions of E string)

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