refactor: string extend method

test/test.c

@@ -1,26 +1,31 @@
-/**
- * Ignore this file
- */
-
-#include <assert.h>
-#include <stdio.h>
-
-int main(void) {
-	puts("==== [Running Hashmap tests] ====");
-	test_hm1();
-	puts("OK!");
-	puts("");
-
-	puts("==== [Running Queue tests] ====");
-	test_q1();
-	puts("OK!");
-	puts("");
-
-	puts("==== [Running String tests] ====");
-	test_str1();
-	test_str2();
-	puts("OK!");
-	puts("");
-
-	return 0;
-}
+/**
+ * Ignore this file
+ */
+
+#include <assert.h>
+#include <stdio.h>
+
+void test_hm1();
+void test_q1();
+void test_str1();
+void test_str2();
+
+int main(void) {
+	puts("==== [Running Hashmap tests] ====");
+	test_hm1();
+	puts("OK!");
+	puts("");
+
+	puts("==== [Running Queue tests] ====");
+	test_q1();
+	puts("OK!");
+	puts("");
+
+	puts("==== [Running String tests] ====");
+	test_str1();
+	test_str2();
+	puts("OK!");
+	puts("");
+
+	return 0;
+}