bench: refactor to use string interpolation in iter/push

PR-URL: #10434
Ref: #8647
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: sagar7162

lib/node_modules/@stdlib/iter/push/benchmark/benchmark.js

@@ -25,6 +25,7 @@ var randu = require( '@stdlib/random/iter/randu' );
 var iterEmpty = require( '@stdlib/iter/empty' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var iterPush = require( './../lib' );
 
@@ -53,7 +54,7 @@ bench( pkg, function benchmark( b ) {
 	b.end();
 });
 
-bench( pkg+'::iteration', function benchmark( b ) {
+bench( format( '%s::iteration', pkg ), function benchmark( b ) {
 	var args;
 	var iter;
 	var it;