Estimated hours taken: 0.5
library/library.m:
Add multi_map to the import_module line so that it get's included
in the library.
library/string.m:
Add a hidden predicate so that float's get printed correctly by
string__format.
If float was smaller the 1e-4 it string__float_to_string converts
it to the form x.xxxxxe-xx and when you print %f.2 you get
x.xx not 0.00 as you should.