C#: method name should be PascalCase (Please refer to implementation of backward compatibility here )

C#: method name should be PascalCase (Please refer to implementation of backward compatibility here )

Description should be language-agnostic

You can round up the distance to 10 decimal places

"You can" is not the same thing as "you must". Also, it's not clear what whether "round up" is supposed to represent ceiling or regular rounding.

According to the test description:
"Points inside list don't have to been sorted (any order is valid)."

In Golang, the tests failed when I provided the elements in "any order".
Noice how [3,1] and [2,1] are swapped, as are [1,2] and [3,2]. Otherwise, the arrays are identical.

Expected
<[][]int | len:8, cap:8>: [[1, 1], [2, 1], [3, 1], [1, 2], [3, 2], [1, 3], [2, 3], [3, 3]]
to equal
<[][]int | len:8, cap:8>: [[1, 1], [3, 1], [2, 1], [3, 2], [1, 2], [1, 3], [2, 3], [3, 3]]