Update Day_21.md

Author: darkprinx

Status/Day_21.md

@@ -28,7 +28,10 @@ li = [12,24,35,70,88,120,155]
 li = [li[i] for i in range(len(li)) if i not in (0,4,5)]
 print(li)
 ```
+---
 ```python
+'''Solution by: pratikb0501
+'''
 li = [12, 24, 35, 70, 88, 120, 155]
 print(list(j for i, j in enumerate(li) if i != 0 and i != 4 and i != 5))