yes

tests/hello.c

@@ -8,5 +8,6 @@ int main(void)
 {
 	int len;
 
-	len = _printf("Hello world");
+	len = _printf("Hello world\n");
+	return (len);
 }

tests/str_print.c

@@ -9,10 +9,11 @@
 
 int main(void)
 {
-	char test_0[] = "Hej";
+	char *test_0 = "Hej";
 /*
  * Brain ded to think bout test cond
  */
-	return (_printf("%s", test_0));
+	_printf("%s \n", test_0);
+	return (_printf("hey, %s", test_0));
 
 }

tests/test.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/bash
+gcc -Wall -pedantic -Werror -Wextra -std=gnu89 $1 ../*.c -o a
+./a