Strchr et fgets

	  int Ind                      =  strcspn (interm_lib,   "\n") ;
	  if     ( Ind                 !=  strlen  (interm_lib) )
                    {   interm_lib [Ind]     = ' '  ;}

int  ch = 'r';
 char *pdest;
   int result;

result = (int)(pdest - string + 1);
   if ( pdest != NULL )
      printf( "Result:   first %c found at position %d\n", 
              ch, result );
   else
      printf( "Result:   %c not found\n" );