Improved String to Hex

#include <iostream>

char NibbleToChar(char nibble){
    return nibble > 9 ? nibble + 'A' - 10 : nibble + '0';
}

char* StrToHex(char* Src, size_t size){
    char* HexString = new char[size * 2 + 1](); //() will initialize it as nulled string

    for (int i = 0; i < size; i++){
        HexString[i * 2] = NibbleToChar(Src[i] >> 4);
        HexString[i * 2 + 1] = NibbleToChar(Src[i]&0xF);
    }
    return HexString;

}
int main(){
    std::cout << StrToHex("Hello World!", sizeof("Hello World!")) << std::endl;
    system("PAUSE>NUL");
    return 0;
}