Date Format

Create a function that converts a date formatted as MM/DD/YYYY to YYYYDDMM.

Examples

format_date("11/12/2019") ➞ "20191211"

format_date("12/31/2019") ➞ "20193112"

format_date("01/15/2019") ➞ "20191501"

Notes

Return value should be a string.