bench: refactor to use string interpolation in blas/base/srotg

PR-URL: #10453

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: Lokeshranjan8

lib/node_modules/@stdlib/blas/base/srotg/benchmark/benchmark.js

@@ -24,6 +24,7 @@ var bench = require( '@stdlib/bench' );
 var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var Float32Array = require( '@stdlib/array/float32' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var srotg = require( './../lib' );
 
@@ -61,7 +62,7 @@ bench( pkg, function benchmark( b ) {
 	b.end();
 });
 
-bench( pkg+':assign', function benchmark( b ) {
+bench( format( '%s:assign', pkg ), function benchmark( b ) {
 	var out;
 	var x;
 	var y;