use solution_t consistently

exercises/practice/zebra-puzzle/.meta/example.c

@@ -69,7 +69,7 @@ static const char *nationality_to_string(enum nationality nationality)
    assert(false);
 }
 
-struct solution solve_puzzle()
+solution_t solve_puzzle()
 {
    int num_solutions = 0;
    enum nationality drinks_water = -1;
@@ -165,7 +165,7 @@ struct solution solve_puzzle()
    } while (next_permutation(colors, house_by_color));
 
    assert(num_solutions == 1);
-   return (struct solution){
+   return (solution_t){
       .drinks_water = nationality_to_string(drinks_water),
       .owns_zebra = nationality_to_string(owns_zebra),
    };

exercises/practice/zebra-puzzle/.meta/example.h

@@ -1,11 +1,11 @@
 #ifndef ZEBRA_PUZZLE_H
 #define ZEBRA_PUZZLE_H
 
-struct solution {
+typedef struct {
    const char *drinks_water;
    const char *owns_zebra;
-};
+} solution_t;
 
-struct solution solve_puzzle(void);
+solution_t solve_puzzle(void);
 
 #endif

exercises/practice/zebra-puzzle/test_zebra_puzzle.c

@@ -11,14 +11,14 @@ void tearDown(void)
 
 static void test_who_drinks_water(void)
 {
-   struct solution solution = solve_puzzle();
+   solution_t solution = solve_puzzle();
    TEST_ASSERT_EQUAL_STRING("Norwegian", solution.drinks_water);
 }
 
 static void test_who_owns_the_zebra(void)
 {
    TEST_IGNORE();   // delete this line to run test
-   struct solution solution = solve_puzzle();
+   solution_t solution = solve_puzzle();
    TEST_ASSERT_EQUAL_STRING("Japanese", solution.owns_zebra);
 }
 

exercises/practice/zebra-puzzle/zebra_puzzle.h

@@ -6,6 +6,6 @@ typedef struct {
    const char *owns_zebra;
 } solution_t;
 
-struct solution solve_puzzle(void);
+solution_t solve_puzzle(void);
 
 #endif