Refactor NIP19 implementation and add tests

Closes: #837

damus-c/damus.h

@@ -9,72 +9,10 @@
 #define damus_h
 
 #include <stdio.h>
+#include "nostr_bech32.h"
+#include "block.h"
 typedef unsigned char u8;
 
-#define MAX_BLOCKS 1024
-#define MAX_RELAYS 10
-
-enum block_type {
-    BLOCK_HASHTAG = 1,
-    BLOCK_TEXT = 2,
-    BLOCK_MENTION_INDEX = 3,
-    BLOCK_MENTION_BECH32 = 4,
-    BLOCK_URL = 5,
-    BLOCK_INVOICE = 6,
-};
-
-enum nostr_bech32_type {
-    NOSTR_BECH32_NOTE = 1,
-    NOSTR_BECH32_NPUB = 2,
-    NOSTR_BECH32_NPROFILE = 3,
-    NOSTR_BECH32_NEVENT = 4,
-    NOSTR_BECH32_NRELAY = 5,
-    NOSTR_BECH32_NADDR = 6,
-};
-
-typedef struct str_block {
-    const char *start;
-    const char *end;
-} str_block_t;
-
-typedef struct invoice_block {
-    struct str_block invstr;
-    union {
-        struct bolt11 *bolt11;
-    };
-} invoice_block_t;
-
-typedef struct mention_bech32_block {
-    struct str_block str;
-    enum nostr_bech32_type type;
-
-    u8 *event_id;
-    u8 *pubkey;
-    char *identifier;
-    char *relays[MAX_RELAYS];
-    int relays_count;
-    int kind;
-
-    u8* buffer;
-} mention_bech32_block_t;
-
-typedef struct block {
-    enum block_type type;
-    union {
-        struct str_block str;
-        struct invoice_block invoice;
-        struct mention_bech32_block mention_bech32;
-        int mention_index;
-    } block;
-} block_t;
-
-typedef struct blocks {
-    int num_blocks;
-    struct block *blocks;
-} blocks_t;
-
-void blocks_init(struct blocks *blocks);
-void blocks_free(struct blocks *blocks);
 int damus_parse_content(struct blocks *blocks, const char *content);
 
 #endif /* damus_h */