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fix bug: remove surplus blanks in url
Xuetangx has some malformed HTMLs, like this: <a href=&coursera-dl#34; /c4x/TsinghuaX/70250023X/asset/LST0-1-0___________.zip&coursera-dl#34;>一个有趣应用-动画文件</a></pre><p></p></o1> in http://www.xuetangx.com/courses/course-v1:TsinghuaX+70250023X_2015_2+sp/courseware/bfbdec0177a7466d9b6bc48c011ee401/63a0945fa22d486fa4e6976802f1f037/ from which the extracted url is 'http://www.xuetangx.com /c4x/TsinghuaX/70250023X/asset/LST0-1-0___________.zip', and it's necessary to remove the space.
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