c: Finish the phogen module

This commit implements the `phogen_encode` function, which takes a bhash
as argument and generates a phonetic string.

c/phogen/phogen_map/phogen_map.c

@@ -452,7 +452,6 @@ void phogen_rstrip(char *str, char *what)
     }
 }
 
-
 /*
  * Take the buffer in `bigin` and treat is as a big-endian big number.
  * Perform a division using the 32-bit divisor in `base` and return the