Merge pull request #73 from Billsfriend/exercism-sync/a38daade01e8bac7

[Sync Iteration] c/diamond/2

Author: github-actions[bot]

solutions/c/diamond/2/diamond.c

@@ -0,0 +1,48 @@
+#include "diamond.h"
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+char **make_diamond(const char letter) {
+    if (letter > 'Z' || letter < 'A') {
+        return NULL;
+    }
+    int axis_len = letter - 'A';
+    int line_count = axis_len * 2 + 1;
+    char **diamond = malloc(line_count * sizeof(char*));
+    if (diamond == NULL) {
+        return NULL;
+    }
+    for (int i = 0; i < line_count; i++) {
+        diamond[i] = malloc(sizeof(char[line_count]));
+        if (diamond[i] == NULL) {
+            for (int j = 0; j < i; j++) {
+                free(diamond[j]);
+                free(diamond);
+                return NULL;
+            }
+        }
+        for (int j = 0; j < line_count; j++) {
+            char temp_letter = 'A' + i > letter ? 2 * letter - 'A' - i : 'A' + i;
+            int l1 = ((i + j) == axis_len);
+            int l2 = ((i + j) == 3 * axis_len);
+            int l3 = ((i - j) == axis_len);
+            int l4 = ((j - i) == axis_len);
+            diamond[i][j] = l1 || l2 || l3 || l4 ? temp_letter : ' ';
+        }
+        diamond[i][line_count] = '\0';
+    }
+    return diamond;
+}
+
+void free_diamond(char **diamond) {
+    if (diamond == NULL) {
+        return;
+    }
+    size_t len = strlen(diamond[0]);
+    for (size_t i = 0; i < len; i++) {
+        free(diamond[i]);
+    }
+    free(diamond);
+}

solutions/c/diamond/2/diamond.h

@@ -0,0 +1,7 @@
+#ifndef DIAMOND_H
+#define DIAMOND_H
+
+char **make_diamond(const char letter);
+void free_diamond(char **diamond);
+
+#endif