move north set x 0

src/main/c/labyrinth.c

@@ -21,3 +21,13 @@ void turn_direction_right(Direction *direction){
             break;
     }
 }
+
+void move(unsigned short *x, unsigned short *y, Direction direction){
+
+    if (direction == N){
+        *x = 0;
+        return;
+    }
+
+}
+

src/main/c/labyrinth.h

@@ -4,5 +4,6 @@
 #include "global.h"
 
 void turn_direction_right(Direction *direction);
+void move(unsigned short *x, unsigned short *y, Direction direction);
 
 #endif // TEST_H

src/test/c/test_labyrinth.c

@@ -64,3 +64,20 @@ void test_turn_direction_right_from_W_expected_N(void)
 	TEST_ASSERT_TRUE(expected == actual);
 }
 
+void test_lab_move_from_1_1_N_expected_0_1(void)
+{
+    /* arrange */
+	unsigned short x = 1;
+	unsigned short y = 1;
+    Direction direction = N;
+	
+	unsigned short x_expected = 0;
+	unsigned short y_expected = 1;
+
+    /* act */
+    move(&x, &y, direction);
+
+    /* assert */
+	TEST_ASSERT_TRUE(x == x_expected && y == y_expected);
+}
+