Your task is to complete a method that swaps adjacent values in an array of integers. For example, if the array contains the values

1 4 9 16 25 36
then after calling the method, it should contain the values 
4 1 16 9 36 25

If the array contains an odd number of elements, leave the last element in place. For example,

1 4 9 16 25 36 45
becomes 
4 1 16 9 36 25 45