Move all negative elements at the end of array

Given an array of integer values which are contain negative and positive values. And our goal is to move all negative elements at the end of array without using any extra space. Order of negative elements are not important. For example.

Example A

Before : 
arr1 []  = {1 , -1 , 3 , 2 , -7 , -5 , 11 , 6}

After Move : 
arr1 []  = {1,  6,  3,  2,  11,  -5,  -7,  -1}

Example B

Before : 
arr2 []  = {-1,  -5,  3,  2,  -7,  -5,  11,  -6}

After Move : 
arr2 []  = {11,  2,  3,  -5,  -7,  -5,  -1,  -6}

Here given code implementation process, Which takes O(n) time.

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