Given an array of integers, find the largest number possible. The numbers should be appended to each other in any order to form the largest number. Return this number in string format.

Let array `arr`

equal to `[ 10, 68, 75, 7, 21, 12 ]`

. The largest number formed by appending is `77568211210`

, therefore the solution should return the string `77568211210`

.

Contributed by Murat Sütunç

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