[Sync Iteration] c/secret-handshake/1

solutions/c/secret-handshake/1/secret_handshake.c

@@ -0,0 +1,38 @@
+#include "secret_handshake.h"
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_COMMAND 4
+
+static const char *all_commands[] = {"wink", "double blink", "close your eyes", "jump"};
+
+const char **commands(size_t number) {
+    int binary_seq[MAX_COMMAND + 1];
+    int binary_count = 0;
+    int reverse_seq = 0;
+    while (number > 0) {
+        binary_seq[binary_count++] = number % 2;
+        number /= 2;
+    }
+    if (binary_count > MAX_COMMAND) {
+        reverse_seq = 1;
+        binary_count--;
+    }
+    const char **final_commands = calloc(MAX_COMMAND, sizeof(char*));
+    int command_count = 0;
+    if (reverse_seq) {
+        for (int i = binary_count-1; i >= 0; i--) {
+            if (binary_seq[i]) {
+                final_commands[command_count++] = all_commands[i];
+            }
+        }
+    } else {
+        for (int i = 0; i < binary_count; i++) {
+            if (binary_seq[i]) {
+                final_commands[command_count++] = all_commands[i];
+            }
+        }
+    }
+    return final_commands;
+}

solutions/c/secret-handshake/1/secret_handshake.h

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+#ifndef SECRET_HANDSHAKE_H
+#define SECRET_HANDSHAKE_H
+
+#include <stddef.h>
+
+const char **commands(size_t number);
+
+#endif