Refactor and docs: fix typo, reformat code, update README

README.md

@@ -79,10 +79,12 @@ or clone the repository first, and then update submodules with:
 git submodule update --init --recursive
 ```
 
-Install cmake (and libasan on Linux) then:
+Install cmake (and libasan on Linux) then compile:
 
+Choose **one** of the following build methods:
+* Incremental Build (Fastest): if you have a previous build to reuse the existing `build` directory and preserve previous build artifacts, go straight to the `cd build` step.
+* Clean Build (From Scratch): Run `cmake -E rm -rf build && cmake -E make_directory build` for your first build, or for a full rebuild to ensure a "clean state" by deleting all previous build data.
 ```
-mkdir build
 cd build
 cmake ..
 cmake --build .

src/pcm.cpp

@@ -184,7 +184,7 @@ void print_output(PCM * m,
         case 2:
             if (m->isCoreCStateResidencySupported(0))
             {
-                cout << " UTIL  : utlization (same as core C0 state active state residency, the value is in 0..1) \n";
+                cout << " UTIL  : utilization (same as core C0 state active state residency, the value is in 0..1) \n";
             }
             cout << " IPC   : instructions per CPU cycle\n";
             if (m->isActiveRelativeFrequencyAvailable())