fix coding style

Insert a space between a reserved name and a parenthesis, etc.
insert spaces consistently

Add spaces before and after comments, etc.
fix coding style

Break a line before '{' and after '}'.
fix coding style

Break a line before '{'.
Additionally, change a 'sentence' to '文', because '文' is used in the
previous code block.
Merge pull request #69 from k-takata/fix-coding-style

Fix coding style