Hash a string using a polynomial rolling hash function.

See https://cp-algorithms.com/string/string-hashing.html for a description of the algoithim.

Replaces "-" with "_" in a string

Example

iex> Cldr.String.to_underscore("this-one")
"this_one"

This is the code of Macro.underscore with modifications:

The change is to cater for strings in the format:

This_That

which in Macro.underscore gets formatted as

this__that (note the double underscore)

when we actually want

that_that