diff --git a/c02/common.c b/c02/common.c
new file mode 100644
index 0000000..c1c70e3
--- /dev/null
+++ b/c02/common.c
@@ -0,0 +1,38 @@
+#include <string.h>
+#include <stdio.h>
+#define TEST_SOURCE      "HeLlo world!\0It's a\tBEAUTIFUL\tday!"
+#define TEST_SOURCE_LENGHT 35
+#define TEST_DESTINATION "GooDBye\0and thanks \tfor\rall the fish!"
+#define TEST_DESTINATION_LENGHT 38
+#define FG_WHT  "\x1B[37m"
+#define FG_MAG  "\x1B[35m"
+#define COLOR_RESET "\x1B[0m"
+
+
+
+void	dump(char *data, int len)
+{
+	int	i = 0;
+
+	while (i < len)
+	{
+		if (data[i] >= ' ' && data[i] < 127)
+			printf(" %c ", data[i]);
+		else
+			printf(FG_MAG "\\%02u" COLOR_RESET, data[i]);
+		i++;
+	}
+	printf("\n");
+}
+
+int	bufcmp(char *this, char *other, int len)
+{
+	int i = 0;
+	while (i < len)
+	{
+		if (this[i] != other[i])
+			return (i + 1);
+		i++;
+	}
+	return (0);
+}
diff --git a/c02/ex00.c b/c02/ex00.c
index 248dee6..8290f98 100644
--- a/c02/ex00.c
+++ b/c02/ex00.c
@@ -1,9 +1,25 @@
+#include "common.c"
 char *ft_strcpy(char *dest, char *src);
-int main(void)
+int	main(void)
 {
-	char s[100] = "hello";
-	char d[100] = "goodbye";
-
-	ft_strcpy(s, d);
+	char s1[100] = TEST_SOURCE;
+	char d1[100] = TEST_DESTINATION;
+	char s2[100] = TEST_SOURCE;
+	char d2[100] = TEST_DESTINATION;
+	char* r1, *r2;
 
+	
+	printf("initial strings:\n");
+	dump(s1, TEST_SOURCE_LENGHT);
+	dump(d1, TEST_DESTINATION_LENGHT);
+	r1 = strcpy(d1 ,s1);
+	printf("strcpy:\n");
+	dump(s1, TEST_SOURCE_LENGHT);
+	dump(d1, TEST_DESTINATION_LENGHT);
+	r2 = ft_strcpy(d2, s2);
+	printf("ft_strcpy:\n");
+	dump(s2, TEST_SOURCE_LENGHT);
+	dump(d2, TEST_DESTINATION_LENGHT);
+	printf("buffers comparison: s:%i d:%i\n", bufcmp(s1, s2, TEST_SOURCE_LENGHT), bufcmp(d1, d2, TEST_DESTINATION_LENGHT));
+	printf("return values comparison: %li %li", d1 - r1, d2 - r2);
 }