$($a$)$ Remove rows where at least a given fraction $"f"$ of the values are negative

$($b$)$ Replace negatives in each of the remaining rows with average value of non$-$negative $($greater than

or equal to $0)$ numbers in the same column; if there are no non$-$negative values in the column,

replace it with $0.$

As an example, if we are given the following $2D$ array $(56)$ :

$-1,4,3,2,-3,2$

$-2,3,5,-4,0,1$

$-1,-3,-4,1,-1,0$

$-1,2,-3,6,5,3$

$-3,2,-3,-5,0,0$

Step $($a$)$ will produce the following if the given fraction $f=\frac{1}{2}$ :

$-1,4,3,2,-3,2$

$-2,3,5,-4,0,1$

$-1,2,-3,6,5,3$

Step $($b$)$ will produce the following:

$0,4,3,2,2\mathrm{.}5,2$

$0,3,5,4,0,1$

$0,2,4,6,5,3$

You are given a starter Java file where you need to complete the code in the $2$ functions

extract$()$ and replace$()$ which correspond to the $2$ steps $($a$)$ and $($b$).$

You are encouraged to test with other examples.