refactoring: renamed function calLen() to calculateStringLength and inner variables in order to increase readability. Now it is easier to understand.

src/helperFunctions.c

@@ -142,10 +142,10 @@ double balanceToDouble(char *balanceAsString)
 	return sign * result / power;
 }
 
-unsigned int calLen(char *str){
-	int len = 0;
-	while(*(str+len)!='\0') ++len;
-	return len;
+unsigned int calculateStringLength(char *string){
+	int length = 0;
+	while(*(string+length)!='\0') ++length;
+	return length;
 }
 
 bool characterIsUpperCase(char inputCharacter)

src/helperFunctions.h

@@ -13,6 +13,6 @@ unsigned int power(unsigned int, unsigned int);
 bool everyCharacterIsDigit(char *);
 bool isLetterOfAlphabet(char *);
 double balanceToDouble(char *);
-unsigned int calLen();
+unsigned int calculateStringLength(char *);
 bool charIsUpperCase(char );
 #endif