refactoring: changed read only parameter of function from int to const int

src/conversionOfNumbers/conversionOfNumbers.c

@@ -51,7 +51,7 @@ unsigned int convertBinaryStrToInt(char* input){
     return result;
 }
 
-int hexStrLen(int input){
+int hexStrLen(const int input){
     int length = 0;
     if(input == 0) return 1;
     for (int x = 0; x <= input; x++){

src/conversionOfNumbers/conversionOfNumbers.h

@@ -5,6 +5,6 @@ char* convertIntToBinaryStr(int input);
 int binaryStrLen(int input);
 unsigned int convertBinaryStrToInt(char* input);
 char* convertIntToHex(int input);
-int hexStrLen(int input);
+int hexStrLen(const int input);
 
 #endif