perl - In XS, how do I get a variables address from its name? -

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In XS, how do I change a string that holds a variable name in its name, I want to do something like the following Perl code: 

  our $ var = 1; Print $ {$ Main: {var}}; In this, it says:  
 
 
 
 If you know the name of a scalar variable, you can get an indicator in your SV using the following:  
  SV * get_sv ("package :: varname", FALSE);

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