c++ 에서 특수 문자 어떻게 지우나요?

       #include<iostream>    

       #include<fstream>    

       #include<sstream>    

       #include<string>    

       #include<iomanip>    

       usingnamespace std;    

       constint ArrayMax = 50000;    

       int readData(string *words)    

{

  ifstream infile;

  string line;

  string fileName;

  cout << "Type the name of text to read ";

  cin >> fileName;

  cout << "Opening File: " << "\""<< fileName <<"\""<<endl;

  infile.open (fileName); //name of file here. plz mention Complete path if file is not at root

int count=0;

  string data;

if (infile.is_open()) //if file opened

{

while(infile>>data)

{

      words[count] = data;

      count++;

}

return count;

}

else//if file not found show the below message

{

      cout << "Sorry, we could not find the file." << endl;

}

    infile.close();

return -1;  

}

       void removeSpecialCharacter(string s)    

{

for (int i = 0; i < s.size(); i++)

{

// Finding the character whose

// ASCII value fall under this

// range

if (s[i] < 'A' || s[i] > 'Z' && s[i] < 'a' || s[i] > 'z')

{

// erase function to erase

// the character

            s.erase(i, 1);

            i--;

}

}

}

string cleanWord(string in)

{

  string data = "";

char ch;

for(unsignedint i = 0; i < in.length(); i++)

{

    ch = in[i];

//convert upper case to lower

if(ch >= 'A' && ch <= 'Z' )

{

      data += ch-'A'+'a';

}

elseif(ch>='0' && ch<='9' )

{

        data += ch;

}

elseif(ch>='a' && ch<='z' )

{

        data += ch;

}

/////////////      else

////////////////      {

 ///////////////////       data.erase(i, 1);

  ////////////////    }

}

return data;

}

       void cleanAndStoreToFile(string *word,int count)    

{

  ofstream myfile ("ast1log.txt");

  cout << "Exporting data to file......" << endl;

for(int i=0; i < count; i++)

{

    myfile << word[i] << " ===> " << cleanWord(word[i]) << endl;

}

}

       int main()     

{

  string words[ArrayMax];

  cout << "Array size is : " << ArrayMax << endl;

int count = readData(words);

  cleanAndStoreToFile(words,count);  

  cout << "Finished Reading " << count <<" words. Closing File." << endl;

  cout << "Commands" << endl;

  cout << "Unigram: search for unigram" << endl;

  cout << "Bigram : search for bigram" << endl;

  cout << "Save   : save 1gms.txt and 2gms.txt" << endl;

  cout << "Index  : print index of unigram or bigram " << endl;

  cout << "Quit/q : terminate program" << endl;

}

string cleanWord(string in)

에서

파일 읽으면

일단 숫자 포함 대문자 소문자로 빠꾸고 싶은데 어렵네요....

파일 읽는게

*** START OF THIS PROJECT GUTENBERG EBOOK THE TIME MACHINE *** Release Date: October 2, 2004 [EBook #35] Author: H. G. Wells

이라면

*** ===> START ===> start OF ===> of THIS ===> this PROJECT ===> project GUTENBERG ===> gutenberg EBOOK ===> ebook THE ===> the TIME ===> time MACHINE ===> machine *** ===> Release ===> release Date: ===> date October ===> october 2, ===> 2 2004 ===> 2004 [EBook ===> ebook #35] ===> 35 Author: ===> author H. ===> h G. ===> g Wells ===> wells

자꾸 이렇게 되네요.

START ===> start OF ===> of THIS ===> this PROJECT ===> project GUTENBERG ===> gutenberg EBOOK ===> ebook THE ===> the TIME ===> time MACHINE ===> machine Release ===> release Date: ===> date October ===> october 2, ===> 2 2004 ===> 2004 [EBook ===> ebook #35] ===> 35 Author: ===> author H. ===> h G. ===> g Wells ===> wells

원래라면 이렇게 되야하는데....

도움 부탁드려요