c - how to set file pointer with fseek -

I know that after printing this string, my file is at the end of the indicative line: "xyz".

How do I get it at the beginning of the line? (Pointing to X)

  offset = ftell (fp); Fseek (FP, offset - size ("xyz"), SEEK_SET);    Do not seem to work up.  
 How can I get it?  
   
  I have an offset  beginning = ftell (fp)  before reading / writing "Xyz" then  fseek (fp, beginning, SEEK_SET);   
 Is this possible?   

 


  







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