functions for simple string manipulation

kStringManip.h

string subsAfLChar(string input,string character)
{
//return the string after the last occur. of the specified character
int pos = input.rfind(character);
if(pos != -1)
{
    return input.substr(pos+1,string::npos);
}
else {return "";}
}

string subsAfChar(string input,string character)
{
//return the string after the first occur. of the specified character
return input.substr(input.find(character)+1,string::npos);
}

string changeChar2(string input,string charO,string charD)
{
    //change the first occur of a character with another character
    return input.replace(input.find(charO),1,charD);
}

string subsBefChar(string input,string character)
{
//return the string before the first occur. of the specified character
return input.substr(0,input.find(character));
}

string subsBefLChar(string input,string character,bool includeChar=false)
{
//return the string before the last occur. of the specified character
    int pos = input.rfind(character);

        if(pos != -1)
        {
            if (includeChar)
            {
                return input.substr(0,pos)+character;
            }
            else
            {return input.substr(0,pos);}

        }

    else
    {return "";}

}

string preffix(int number,int nZeros,bool printNumber)
{
    //you have a number, and want an unified preffix
    int maxNumb = 10;

    string res = "";

     for(unsigned int i = 1;i<nZeros;i++)
     {
        maxNumb *= 10;
     }

     if (maxNumb < number)
     {
        return "";
     }

     int cont = maxNumb;

     for(;;)
     {
        if (cont > number)
        {
            res+="0";
            cont/= 10;
        }
        else
        {break;}
     }

 //cout<<maxNumb;
if (printNumber)
{
 return res+string(number);
}
else
    {
        return res;
    }
}