Update Day_12.md

Author: darkprinx

Status/Day_12.md

@@ -102,3 +102,7 @@ print(american)
 print(newyorker)
 ```
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+
+[***go to previous day***](https://github.com/darkprinx/100-plus-Python-programming-exercises-extended/blob/master/Status/Day_11.md "Day 11")
+
+[***go to next day***](https://github.com/darkprinx/100-plus-Python-programming-exercises-extended/blob/master/Status/Day_13.md "Day 13")