Move some things to a util source file

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/main.c

@@ -1,9 +1,5 @@
 #include <stdio.h>
-#include <stdlib.h>
-
-#define true 1
-#define false 0
-#define boolean char
+#include "utils.h"
 
 /*
 A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.
@@ -13,11 +9,6 @@ Find the largest palindrome made from the product of two 3-digit numbers.
 https://projecteuler.net/problem=4
 */
 
-struct String{
-    int length;
-    char*str;
-};
-
 struct String numberToString(int numb) {
     int placeValues=0;
     int tempNumb=numb;

src/utils.h

@@ -0,0 +1,7 @@
+#define true 1
+#define false 0
+#define boolean char
+struct String{
+    int length;
+    char*str;
+};