remove deprecated path field and add ipfs field on meme struct

src/api.rs

@@ -35,16 +35,16 @@ pub struct Category {
 pub struct Meme {
     pub id: String,
     pub link: String,
-    pub path: String,
     pub category: String,
     pub user: String,
     #[serde(deserialize_with = "deserialize_timestamp")]
     pub timestamp: i64,
+    pub ipfs: Option<String>,
 }
 
 impl Meme {
     pub fn file_name(&self) -> Result<&str> {
-        self.path
+        self.link
             .split('/')
             .last()
             .ok_or_else(|| anyhow!("failed to get file name. server response invalid"))