sudoku: main: solve grids using heuristics

src/main.c

@@ -1,7 +1,18 @@
 #include <stdio.h>
 
-int main(void) {
-    puts("Hello world");
+#include "constraints.h"
+#include "solver/solve.h"
+#include "sudoku.h"
 
-    return 0;
+int main(void) {
+    struct sudoku grid;
+
+    if (!parse_grid_file(&grid, stdin))
+        return 1;
+
+    solve(&grid);
+
+    print_grid(&grid, stdout);
+
+    return !solved(&grid);
 }