Generalized the handlebars code.

src/util/string.h

@@ -0,0 +1,24 @@
+// Copyright (c) 2021 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include <dawn/dawn.h>
+
+/**
+ * Replaces handlebars within the string with items from the list of variables.
+ * Output of replacement is stored in the buffer provided. Handlebars within the
+ * string should be in the format of; "{{ key }}", spaces within the bars will
+ * be skipped. Variable keys cannot exceed STRING_HANDLEBAR_KEY_MAXLENGTH in
+ * length.
+ * 
+ * @param string String to parse.
+ * @param variables Variables to use in the parsing.
+ * @param variableCount How many variables in the array.
+ * @param buffer Buffer to write characters in to.
+ * @return The count of characters that were written to the buffer.
+ */
+int32_t stringHandlebarsBuffer(char *source,
+  stringhandlebarvariable_t *variables, int32_t variableCount, char *buffer
+);