diff --git a/Ch 1.Arrays And Strings/3.URLify/URLify2.cpp b/Ch 1.Arrays And Strings/3.URLify/URLify2.cpp
deleted file mode 100644
index e1d77c1..0000000
--- a/Ch 1.Arrays And Strings/3.URLify/URLify2.cpp	
+++ /dev/null
@@ -1,40 +0,0 @@
-#include <string>
-
-#include <iostream>
-using namespace std;
-/* in this solution we are using C++ stl/std style */
-string URLify(const string &str)
-{
-	int spacesCnt = 0;
-	string res;
-
-	for (auto &is : str) {
-		if (is == ' ') {
-			++spacesCnt;
-		}
-	}
-//	cout << "# of spaces: " << spacesCnt << endl;
-	auto newSize = str.size() + 2*spacesCnt;
-	res.resize(newSize);
-	cout << " res new size is: " << res.size() << endl;
-	int is=0, ir=0;
-	while (is < str.size()) {
-		if (str[is] != ' ') {
-			res[ir] = str[is];
-		}
-		else if (str[is] == ' ') {
-			res[ir++] = '%';
-			res[ir++] = '2';
-			res[ir] = '0';
-		}
-		++is; ++ir;
-	}
-	return res;
-}
-
-int main()
-{
-	string s = URLify("This is John Smith");
-	cout << " the new string is: " << s << endl;
-	return 0;
-}
diff --git a/Ch 12. C++/k_strings.txt b/Ch 12. C++/k_strings.txt
deleted file mode 100644
index 809a725..0000000
--- a/Ch 12. C++/k_strings.txt	
+++ /dev/null
@@ -1,10 +0,0 @@
-first line in file
-second line in file
-third
-forth
-fifth
-sixth
-seventh
-eightth
-nineth
-
diff --git a/Ch 12. C++/print_k_lines.cpp b/Ch 12. C++/print_k_lines.cpp
deleted file mode 100644
index 6388343..0000000
--- a/Ch 12. C++/print_k_lines.cpp	
+++ /dev/null
@@ -1,48 +0,0 @@
-#include <iostream>
-
-
-#include <string>
-#include <vector>
-#include <fstream>
-using namespace std;
-
-void printKlines (const string &fn, int k)
-{
-	if (k <= 0){
-		cout << "Error invalid K value " << endl;
-		return;
-	}
-	string line;
-	int cnt=0, first=0; ifstream ifs(fn);
-	vector<string> output;
-	while(getline(ifs, line) && !line.empty()) {
-		if(cnt >= k) {
-			output[first] = line;
-			first = (first+1)%k;
-		}
-		else {
-			output.emplace_back(line);
-			++cnt;
-		}
-	}
-
-	int start = first;
-	for (int i=0;  i< (cnt < k ? cnt : k); ++i, start = (start+1)%k) {
-		cout << output[start] << endl;
-	}
-
-}
-
-int main()
-{
-	string fn;// = "k_strings.txt";
-	cout << "Type in the file name: " << endl;
-	cin >> fn;
-	
-	cout << "Type the number of K last lines to print: " << endl;
-	int k;
-	cin >> k;
-	printKlines(fn, k);
-	
-	return 0;
-}
diff --git a/Chapter-16-moderate/test_word_freq b/Chapter-16-moderate/test_word_freq
deleted file mode 100644
index 0a6619e..0000000
--- a/Chapter-16-moderate/test_word_freq
+++ /dev/null
@@ -1,7 +0,0 @@
-aa bb cc aa dd aa
-xxaa
-
-xx aa
-yy
-zz
-
diff --git a/Chapter-16-moderate/word_freq.cpp b/Chapter-16-moderate/word_freq.cpp
deleted file mode 100644
index dc1934b..0000000
--- a/Chapter-16-moderate/word_freq.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-#include <iostream>
-#include <string>
-#include <fstream>
-#include <sstream>
-#include <map>
-#include <cctype>
-#include <algorithm>
-
-using namespace std;
-
-/*count freq 
- *
- *
- *
- * @parmas:
- * filename - the book file name to read the lines and words from
- * word - the word to lookup for in the book
- * @return value:
- * integer - the number of occurences in the document	
- *
- * Assumptions:
- * word is a match even is upper case and lower case are not match 
- * the word maybe part of a line
- *
-*/
-
-int countWordFreq(const string & fileName, const string &word)
-{
-	cout << "file path is: " << fileName << endl;
-	ifstream ifn(fileName);
-	static map<string, int> wordFreq;
-	string tword;
-	transform(word.begin(), word.end(), tword.begin(), ::tolower);
-
-	if (!wordFreq.empty()) {
-		cout << "wordFreq is not empty" << endl;
-		cout << wordFreq[word] << endl;
-		return wordFreq[word];
-	}
-
-	string line;
-	while (getline(ifn, line)) {
-		if(line.empty()) { continue; }
-		stringstream ss(line);
-		string w;
-		while(ss >> w) {
-			transform(w.begin(), w.end(), w.begin(), ::tolower);
-			wordFreq[w]++;
-		}
-	}
-
-	return wordFreq[word];
-}
-
-int main()
-{
-	string fileName;
-
-	cout << "type the book file (full path): " << endl;
-	cin >> fileName;
-	//cout << countWordFreq("../input/test_word_freq", "aa") << endl;
-	cout << countWordFreq(fileName, "aa") << endl;
-
-
-	return 0;
-}