removed the code of making Unicode string

Author: makeajourney

Diff for: pandas/io/parsers.py

@@ -2564,7 +2564,7 @@ def _infer_columns(self):
                         while cur_count > 0:
                             counts[col] = cur_count + 1
                             col = '{column}.{count}'.format(
-                                column=u''.join(col), count=cur_count)
+                                column=col, count=cur_count)
                             cur_count = counts[col]
 
                         this_columns[i] = col