Add logic to label fans, some cleanup

app/src/fan/FanLabeler.cxx

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <string>
+
+#include <fan/FanLabeler.h>
+
+using namespace std;
+
+void FanLabeler::RunFanLabelInteraction(
+    std::vector<std::shared_ptr<Fan>> fans) {
+  cout << "Setting all fans to their minimum value" << endl;
+
+  for (auto f : fans) {
+    f->PWM(0);
+  }
+
+  cout << endl;
+
+  for (auto f : fans) {
+    cout << "Setting fan to max power" << endl;
+
+    f->PWM(100);
+
+    cout << "Look inside your PC and check which fan is\n"
+            "spinning fastest and enter a name for it.\n"
+            "Just press enter to skip."
+         << endl;
+
+    std::string name;
+    getline(cin, name);
+
+    if (!name.empty()) {
+      cout << "Setting " << name << " as label for this fan." << endl;
+      f->Label(name);
+    }
+
+    cout << "Resetting fan to lowest value\n\n" << endl;
+    f->PWM(0);
+  }
+
+  cout << "Done!\n" << endl;
+}