diff --git a/README.md b/README.md
index 87fe6e2..bbab8c7 100644
--- a/README.md
+++ b/README.md
@@ -7,12 +7,20 @@
 TODO
 
 ### Build
-
-TODO
+run this command:
+    autoreconf --force --verbose --install
 
 ### Test
+run this command:
+     ./configure CFLAGS='-std=c99 -Werror -Wall -Wextra -Wvla'
+then:
+    make
 
-TODO
+#### asan
+run this command:
+    ./configure CFLAGS='-std=c99 -Werror -Wall -Wextra -Wvla -g -fsanitize=address'
+then:
+    make check
 
 ## Authors
 
diff --git a/configure.ac b/configure.ac
index 4a89a36..f9684ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,9 @@
 # Init the 42sh project
 AC_INIT([42sh], [1.0], [matteo.flebus@epita.fr])
 
+# FLAGS="-std=c99 -pedantic -Werror -Wall -Wextra -Wvla"
+# AC_SUBST([FLAGS])
+
 # Setup Automake
 AM_INIT_AUTOMAKE([subdir-objects] [foreign])
 
@@ -21,10 +24,17 @@ AC_PROG_CC
 
 # List Makefiles in subdirectories
 AC_CONFIG_FILES([
-                    Makefile
                     src/Makefile
                     src/ast/Makefile
                     src/parser/Makefile
                     src/lexer/Makefile
+                    src/io_backend/Makefile
+                    src/execution/Makefile
+                    src/expansion/Makefile
+                    src/utils/Makefile
                 ])
+                    # TODO add tests Makefile here
+                    # tests/Makefile
+                    # tests/unit/Makefile
+                    # tests/unit/utils/Makefile
 AC_OUTPUT
diff --git a/src/Makefile.am b/src/Makefile.am
index 8ecd21f..411f4cb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,11 +1,10 @@
 # define the subdirectories
 SUBDIRS = \
-		ast \
 		parser \
 		lexer \
 		io_backend \
 		execution \
-		expansin \
+		expansion \
 		utils
 
 bin_PROGRAMS = 42sh
@@ -14,10 +13,7 @@ bin_PROGRAMS = 42sh
 
 42sh_CPPFLAGS = -I%D%
 
-42sh_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 42sh_LDADD =  \
-		ast/libast.a \
 		parser/libparser.a \
 		lexer/liblexer.a \
 		io_backend/libio_backend.a \
@@ -27,20 +23,16 @@ bin_PROGRAMS = 42sh
 
 
 ################################################# Test
-
-bin_PROGRAMS = 42sh_asan
-
-42sh_asan_SOURCES = main.c
-
-42sh_asan_CPPFLAGS = -I%D%
-
-42sh_asan_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla -g -fsanitize=address
-
-42sh_asan_LDADD =  \
-		ast/libast.a \
-		parser/libparser.a \
-		lexer/liblexer.a \
-		io_backend/libio_backend.a \
-		expansion/libexpansion.a \
-		execution/libexecution.a \
-		utils/libutils.a
+#
+#42sh_asan_SOURCES = main.c
+#
+#42sh_asan_CPPFLAGS = -I%D%
+#
+#42sh_asan_LDADD =  \
+#		ast/lib_asan_ast.a \
+#		parser/lib_asan_parser.a \
+#		lexer/lib_asan_lexer.a \
+#		io_backend/lib_asan_io_backend.a \
+#		expansion/lib_asan_expansion.a \
+#		execution/lib_asan_execution.a \
+#		utils/lib_asan_utils.a
diff --git a/src/ast/Makefile.am b/src/ast/Makefile.am
index 9df484e..fa41e3d 100644
--- a/src/ast/Makefile.am
+++ b/src/ast/Makefile.am
@@ -6,6 +6,4 @@ libast_a_SOURCES =  \
 
 libast_a_CPPFLAGS = -I$(top_srcdir)/src
 
-libast_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 noinst_LIBRARIES = libast.a
diff --git a/src/execution/Makefile.am b/src/execution/Makefile.am
index f83e3ba..5a71cbb 100644
--- a/src/execution/Makefile.am
+++ b/src/execution/Makefile.am
@@ -6,6 +6,4 @@ libexecution_a_SOURCES =  \
 
 libexecution_a_CPPFLAGS = -I$(top_srcdir)/src
 
-libexecution_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 noinst_LIBRARIES = libexecution.a
diff --git a/src/expansion/Makefile.am b/src/expansion/Makefile.am
index 5074622..065f225 100644
--- a/src/expansion/Makefile.am
+++ b/src/expansion/Makefile.am
@@ -6,6 +6,4 @@ libexpansion_a_SOURCES =  \
 
 libexpansion_a_CPPFLAGS = -I$(top_srcdir)/src
 
-libexpansion_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 noinst_LIBRARIES = libexpansion.a
diff --git a/src/io_backend/Makefile.am b/src/io_backend/Makefile.am
index 7f056b2..0cfadff 100644
--- a/src/io_backend/Makefile.am
+++ b/src/io_backend/Makefile.am
@@ -6,6 +6,4 @@ libio_backend_a_SOURCES =  \
 
 libio_backend_a_CPPFLAGS = -I$(top_srcdir)/src
 
-libio_backend_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 noinst_LIBRARIES = libio_backend.a
diff --git a/src/lexer/Makefile.am b/src/lexer/Makefile.am
index a113221..dd11411 100644
--- a/src/lexer/Makefile.am
+++ b/src/lexer/Makefile.am
@@ -6,6 +6,4 @@ liblexer_a_SOURCES =  \
 
 liblexer_a_CPPFLAGS = -I$(top_srcdir)/src
 
-liblexer_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 noinst_LIBRARIES = liblexer.a
diff --git a/src/parser/Makefile.am b/src/parser/Makefile.am
index 51c8cb6..dd13901 100644
--- a/src/parser/Makefile.am
+++ b/src/parser/Makefile.am
@@ -6,6 +6,4 @@ libparser_a_SOURCES =  \
 
 libparser_a_CPPFLAGS = -I$(top_srcdir)/src
 
-libparser_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
 noinst_LIBRARIES = libparser.a
diff --git a/src/utils/Makefile.am b/src/utils/Makefile.am
index dba2e51..5b72df3 100644
--- a/src/utils/Makefile.am
+++ b/src/utils/Makefile.am
@@ -1,11 +1,8 @@
 lib_LIBRARIES = libutils.a
 
-# libutils_a_SOURCES =  \
-#   utils.c \
-#   utils.h
+libutils_a_SOURCES =  \
+	string_utils.c
 
-# libutils_a_CPPFLAGS = -I$(top_srcdir)/src
+libutils_a_CPPFLAGS = -I$(top_srcdir)/src
 
-# libutils_a_CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
-
-# noinst_LIBRARIES = libutils.a
+noinst_LIBRARIES = libutils.a