use variable instead of function

src/textfile/file.go

@@ -35,7 +35,7 @@ func (c *Collector) collectFileContents() {
 			fileName:   fileName,
 		}
 
-		fullPath := filepath.Join(c.folderPath, file.Name())
+		fullPath := filepath.Join(c.folderPath, fileName)
 		content, err := ioutil.ReadFile(fullPath)
 		if err != nil {
 			c.appendErrorForPath(fileName)