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375 jrf 1 
#include <string>
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#include <list>
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#include "string_utils.h"
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using namespace std;
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namespace Util
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{
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  string trim(const string& s, const string& wspaces)
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  {
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    int front = 0;
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    int back = static_cast<int>(s.size() - 1);
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    if(back < front)
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      return string("");
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    while(wspaces.find(s[front]) != wspaces.npos) ++front;
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    while(wspaces.find(s[back]) != wspaces.npos) --back;
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    int n = back - front + 1;
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    if(n < 1)
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      return string("");
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    else
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      return s.substr(front, n);
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  }
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  string trim(const string& s)
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  {
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    return trim(s, " \t\n\r");
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  }
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  void split(const string& s, list<string>& result, const string& delim)
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  {
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    size_t begin = 0;
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    size_t end = s.find(delim);
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    while(end != s.npos)
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    {
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      result.push_back(s.substr(begin, end - begin));
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      begin = end + delim.size();
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      end = s.find(delim, begin);
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    }
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    if(s.size() > begin)
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      result.push_back(s.substr(begin, s.size() - begin));
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  }
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  void split(const string& s, list<string>& result)
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  {
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    return split(s, result, " ");
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  }
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  void trim_split(const string& s, list<string>& result, const string& delim)
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  {
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    size_t begin = 0;
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    size_t end = s.find(delim);
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    while(end != s.npos)
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    {
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      result.push_back(trim(s.substr(begin, end - begin)));
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      begin = end + delim.size();
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      end = s.find(delim, begin);
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    }
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    if(s.size() > begin)
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      result.push_back(trim(s.substr(begin, s.size() - begin)));
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  }
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  void trim_split(const string& s, list<string>& result)
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  {
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    trim_split(s, result, " ");
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  }
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  void get_first(string& s, string& first)
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  {
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    size_t pos = s.find(" ");
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    first = s.substr(0, pos);
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    if(pos == s.npos)
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      s = "";
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    else
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      s.erase(0, pos + 1);
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  }
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  void get_last(string& s, string& last)
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  {
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    size_t pos = s.rfind(" ");
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    last = s.substr(pos + 1);
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    if(pos == s.npos)
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      s = "";
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    else
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      s.erase(pos + 1);
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  }
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}