Add %typemap(in) (char *STRING, size_t LENGTH).
Fix warnings in char_binary.i.
./../char_binary.i:7: Warning 453: Can't apply (char *STRING,size_t LENGTH). No typemaps are defined.
./../char_binary.i:8: Warning 453: Can't apply (char *STRING,size_t LENGTH). No typemaps are defined.
Add a runtime test (it is based on the Python and Go char_binary
runtime tests).
