Revert "Fix bug"

This reverts commit 2c5404e.

ch11/ex11_3_4.cpp

@@ -12,31 +12,15 @@
 #include <iostream>
 #include <map>
 #include <string>
-#include <cctype>
 #include <algorithm>
 
-void remove_punct(std::string &s)
-{
-    auto iter = s.begin();
-    while(iter != s.end())
-    {
-        if(std::ispunct(*iter))
-        {
-            iter =  s.erase(iter);
-        }
-        else
-            ++ iter;
-    }
-}
-
 //! Exercise 11.4
 void word_count_pro(std::map<std::string, int> &m)
 {
-    std::string word;
-    while(std::cin >> word)
+    for(std::string word;   std::cin >> word; /* */)
     {
         for(auto& ch : word)    ch = std::tolower(ch);
-        remove_punct(word);
+        std::remove_if(word.begin(), word.end(), ispunct);
         ++m[word];
 
         for (const auto &e : m)
@@ -48,8 +32,7 @@ void word_count_pro(std::map<std::string, int> &m)
 void ex11_3()
 {
     std::map<std::string, std::size_t> word_count;
-    std::string word;
-    while(std::cin >> word)
+    for(std::string word;   std::cin >> word;   /* */)
     {
         ++word_count[word];
         for (const auto &elem : word_count)