Kata

Implement a function which behaves like the 'uniq -c' command in UNIX.

It takes as input a sequence and returns a sequence in which all duplicate elements following each other have been reduced to one instance together with the number of times a duplicate elements occurred in the original array.

Example:

['a','a','b','b','c','a','b','c'] --> [['a',2],['b',2],['c',1],['a',1],['b',1],['c',1]]

['a','a','b','b','c','a','b','c'] --> [('a',2),('b',2),('c',1),('a',1),('b',1),('c',1)]