refactoring: Funktionsnamen und Parametervariablen verbessert

src/c/funktionen.c

@@ -117,8 +117,8 @@ int calculateCurrent(int voltage, int resistance) {
     return voltage / resistance;
 }
 
-int p(int f, int a) {
-    return f / a;
+int calculatePressure(int force, int area) {
+    return force / area;
 }
 
 float f(float m) {

src/c/funktionen.h

@@ -55,7 +55,7 @@ int characterAppearanceInString(char c, char string[]);
 int calculateCurrent(int voltage, int resistance);
 // berechnet den Strom mithilfe ohmsches Gesetzes
 
-int p(int f, int a);
+int calculatePressure(int force, int area);
 // berechnet den Druck
 
 float f(float m);

src/test/test_funktionen.c

@@ -251,7 +251,7 @@ void test_pressure_at_force360_area12(void)
     /* act */
     int f = 360;
     int a = 12;
-    actual = p(f, a);
+    actual = calculatePressure(f, a);
 
     /* assert */
     TEST_ASSERT_EQUAL_INT(expected, actual);