fixed some tasks (ref #159)

Fixes the tasks below (more remain broken): ref https://github.com/Hoverbear/rust-rosetta/issues/159

src/100_doors.rs
src/24_game.rs
src/99_bottles_of_beer.rs
src/9_billion_names_of_God_the_integer.rs
src/bubble_sort.rs
src/complex.rs
src/dot_product.rs
src/fibonacci_word.rs
src/function_def.rs
src/lzw.rs
src/md5-implementation.rs
src/sort_int.rs