Mumbling Kata
The goal of this kata is to implement the mumble_letters() method which takes a string as input and returns a formatted output string. The output string contains sequences of repeating letters with each letter repeated a number of times based on its position in the input string i.e. the 3rd letter in the string is repeated 3 times. Each sequence of repeated letters is separated with a hyphen(-) and the first letter of each sequence is capitalised.
The following examples illustrate the mumble_letters() method:
mumble_letters("a")
=> "A"
mumble_letters("abC")
=> "A-Bb-Ccc"
mumble_letters("aBCd")
=> "A-Bb-Ccc-Dddd"
mumble_letters("QWERTY")
=> "Q-Ww-Eee-Rrrr-Ttttt-Yyyyyy"
Rules
Note that your mumble_letters() implementation should also handle an empty string input appropriately.