remove_beg&end_spaces

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
const std::string WHITESPACE = " \n\r\t\f\v";

std::string ltrim(const std::string& s)
{
    size_t start = s.find_first_not_of(WHITESPACE);
    return (start == std::string::npos) ? "" : s.substr(start);
}

std::string rtrim(const std::string& s)
{
    size_t e = s.find_last_not_of(WHITESPACE);
    return (e == std::string::npos) ? "" : s.substr(0, e + 1);
}

std::string trim(const std::string& s)
{
    return rtrim(ltrim(s));
}

int main()
{
    std::string s[10];
    s[1] = "\n\t                    g hwetHello World \r\n ";
    std::cout << "START::" << trim(s[1]) << "::end\n";
    s[2]="  jkhgdlkj ";
    cout<<trim(s[2]);

    return 0;
}