use pattern for outputPatterns

outputPatterns should be <prefix>%<suffix>.
It is waste to find % in every time.
parse outputPattern as pattern (<prefix>, <suffix>) and use it.

before:
 repo/android.sh kati -c # with cpuprofile
   82.04s

  canPickImplicitRule 27.17s (34.34%)
  matchPattern 19.11s (23.29%) out of the above
  strings.IndexByte 16.96s (20.67%) out of the above

after:
 repo/android.sh kati -c # with cpuprofile
  64.04s

  canPickImplicitRule 8.08s (12.62%)
  pattern.match 3.45s (5.39%)
4 files changed