Soundex
<algorithm, text> An
algorithm for encoding a word so that similar sounding words encode the same.
The first letter is copied unchanged then subsequent letters are encoded as follows:
bfpv
-> "1" cgjkqsxzç -> "2" dt
-> "3" l
-> "4" mnñ
-> "5" r
-> "6"
Other characters are ignored and repeated characters are encoded as though they were a single character.
Encoding stops when the resulting string is four characters long, adding trailing "0"s if it is shorter.
For example, "SMITH" or "SMYTHE" would both be encoded as "S530".
