$3\mathrm{.}2$ Implementing $k-$means with Manhattan distance $(25$ pts total$)$

$3\mathrm{.}2\mathrm{.}1$ Computing Manhattan distance $(5$pts$)$

Implement the Manhattan distance metric in a function that you can use in your $k-$means

implementation. Write three test cases to be sure your function works correctly.

# TODO: Manhattan distance