Add hex encoding/decoding

src/main.c

@@ -533,6 +533,33 @@ void string_test_utf8(void)
     TRACEF("str4:\n");
     print_runes(str4);  // this should be a valid code point
 
+}
+
+void string_test_hex(void)
+{
+    MArena arena;
+    U8 data[4096];
+    marena_init(&arena, data, sizeof data);
+    Allocator allocator = marena_allocator(&arena);
+
+    Str str1 = S("Hello World ☺");
+
+    Str str1_encoded = str_hex_encode_alloc(&allocator, str1);
+    printf("str1_encoded: '%.*s'\n", str1_encoded.len, str1_encoded.str);
+
+    Str str1_decoded = str_hex_decode_alloc(&allocator, str1_encoded);
+    printf("str1_decoded: '%.*s'\n", str1_decoded.len, str1_decoded.str);
+
+    Str str2 = S("");
+
+    Str str2_encoded = str_hex_encode_alloc(&allocator, str2);
+    printf("str2_encoded: '%.*s'\n", str2_encoded.len, str2_encoded.str);
+
+    Str str2_decoded = str_hex_decode_alloc(&allocator, str2_encoded);
+    printf("str2_decoded: '%.*s'\n", str2_decoded.len, str2_decoded.str);
+
+
+
 }
 
 int main(int argc, char *argv[])
@@ -552,6 +579,7 @@ int main(int argc, char *argv[])
     string_test_misc();
     string_test_join();
     string_test_utf8();
+    string_test_hex();
 
 }