feat(commit): added structs and functionality for the commit log

include/commit.h

@@ -0,0 +1,31 @@
+#ifndef COMMIT_H
+#define COMMIT_H
+
+#include <math.h>
+
+#include "utilities.h"
+
+typedef struct {
+    char* name;
+    char* email;
+    char* timestamp;
+} Author;
+
+typedef struct {
+    char* hash;
+    char* tree_hash;
+    Author* authors;
+    size_t authors_count;
+    Author committer;
+    char* message;
+} Commit;
+
+typedef List CommitLog;
+
+CommitLog* commit_log_new();
+void commit_log_push(CommitLog*, Commit);
+void commit_log_free(CommitLog*);
+int read_commit_log(CommitLog*, char*);
+int write_commit_log(CommitLog*, char*);
+
+#endif // COMMIT_H