diff --git a/d01/ex04/Makefile b/d01/ex04/Makefile
index 81dd985..495c03c 100644
--- a/d01/ex04/Makefile
+++ b/d01/ex04/Makefile
@@ -16,10 +16,11 @@ LIBS      =
 INCLUDES  = -I$(D_HEADERS)
 
 D_SRCS    = .
-SRCS      = main.cpp
+SRCS      = main.cpp \
+			Sed.cpp
 
 D_HEADERS = .
-HEADERS   = 
+HEADERS   = Sed.hpp
 
 D_OBJS    = builds
 OBJS      = $(SRCS:%.cpp=$(D_OBJS)/%.o)
diff --git a/d01/ex04/Sed.cpp b/d01/ex04/Sed.cpp
new file mode 100644
index 0000000..748c9ca
--- /dev/null
+++ b/d01/ex04/Sed.cpp
@@ -0,0 +1,32 @@
+#include "Sed.hpp"
+
+Sed::Sed(char *file, char *find, char *replacement)
+	: _file( file )
+//	, _new_file( file.append(".replace") )
+	, _find( find )
+	, _replacement( replacement )
+{
+
+//	this->_buf = 
+	return;
+
+}
+Sed::~Sed() {
+
+//	delete[] this->_buf;
+	return;
+
+}
+
+void	Sed::replace() {
+
+	std::ifstream	file(this->_file.c_str());
+	char	c;
+
+	while (file.get(c))
+	{
+		std::cout << c;
+	}
+
+}
+
diff --git a/d01/ex04/Sed.hpp b/d01/ex04/Sed.hpp
new file mode 100644
index 0000000..e197139
--- /dev/null
+++ b/d01/ex04/Sed.hpp
@@ -0,0 +1,27 @@
+#ifndef SED_HPP
+# define SED_HPP
+
+#include <iostream>
+#include <string>
+#include <fstream>
+
+class Sed {
+
+public:
+
+	 Sed(char *file, char *find, char *replacement);
+	~Sed();
+
+	void replace( void );
+
+private:
+
+//	std::string			_buf;
+	std::string	const	_file;
+	std::string	const	_new_file;
+	std::string const	_find;
+	std::string const	_replacement;
+
+};
+
+#endif
diff --git a/d01/ex04/main.cpp b/d01/ex04/main.cpp
index e60f061..dbc34af 100644
--- a/d01/ex04/main.cpp
+++ b/d01/ex04/main.cpp
@@ -1,24 +1,28 @@
+#include "Sed.hpp"
+
 #include <iostream>
 #include <string>
-#include <fstream>
 
-int	main() {
+int	sed_error(std::string msg) {
 
-	std::ifstream	file("test.txt");
+	std::cout << msg << std::endl;
+	return 1;
+}
 
-	// read words separated by whitespaces or newlines
-//	std::string		str;
-//	while (file >> str)
-//		std::cout << str << std::endl;
+void	cpp_sed(char **av) {
 
-	// skip whitespaces or newlines
-//	char		c;
-//	while (file >> c)
-//		std::cout << c << std::endl;
-
-	// seems good
-	char	c;
-	while (file.get(c))
-		std::cout << c;
+	Sed	sed(av[1], av[2], av[3]);
+	
+	sed.replace();
+
+}
+
+int	main(int ac, char **av) {
+
+	if (ac != 4)
+		return sed_error("you must provide 3 parameters : <file> <string 1> <string 2>");
+	cpp_sed(av);
+
+	return 0;
 
 }
diff --git a/d01/ex04/sed b/d01/ex04/sed
index a254043..df9acd2 100755
Binary files a/d01/ex04/sed and b/d01/ex04/sed differ