test for strlen (no longer segfaults)

tests/strlen.c

@@ -0,0 +1,19 @@
+#include "../main.h"
+
+/**
+ * main - test strlen
+ * Return: 0 if yes, 1 if no
+ */
+int main(void)
+{
+	char *str;
+	int len;
+
+	str = "hello";
+	len =_strlen(str);
+	if (len == 5)
+		return (0);
+	else
+		return (1);
+
+}