Given a `long`

value `val`

, the `largestSum`

method should return the largest sum calculated from 4 consecutive digits.

For example, if `val`

is `1792511`

the `largestSum`

method would return `23`

which is the sum of 7 + 9 + 2 + 5. Any other 4 digit sequence would add up to a value less than or equal to 23.

Let's look at the sum of all digits, starting with the first 4

$$ \Large \begin{align} 1 + 7 + 9 + 2 &= 19\\\\ 7 + 9 + 2 + 5 &= 23\\\\ 9 + 2 + 5 + 1 &= 17\\\\ 2 + 5 + 1 + 1 &= 9 \end{align} $$

`var`

will be in the range [ 1000 - `Long.MAX_VALUE`

]

**Note: ** The test for this challenge runs 100 random `long`

values. If your code fails, it is unlikely for it to have the exact same number in the next set of tests.

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