Update boilerplate

boilerplate.c

@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
 
 #define DEFAULT_FILE        "input.txt"
 #define STRBUF_LEN          200