reduce console duplicates

Author: ShMcK

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mocha-coderoad",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "mocha test runner & reporter for atom-coderoad",
   "main": "src/runner.js",
   "scripts": {

src/runner.js

@@ -17,8 +17,8 @@ function runner(files, config, handleResult, handleLog) {
             if (!!match) {
                 var printed = data.toString().substring(0, match.index);
                 if (!!printed.length) {
-                    var start = printed.substring(0, printed.length / 2);
-                    var end = printed.substring(printed.length / 2, printed.length);
+                    var start = printed.substring(0, printed.length / files.length);
+                    var end = printed.substring(printed.length / files.length, printed.length);
                     var message = '';
                     if (start === end) {
                         message = start;