separate utility functions (futil.c)
Revert "separate utility functions (futil.c)"

This reverts commit ad59a051beb67c0c06f934c20aa569d5c2f3c45f.
Merge branch 'master' of github.com:kazukifujiwara/FPU
refactor
Merge pull request #2 from ProcessorCompilerExperiment2014-Team0/master

refactoring