Fix edge case where multiple attachments

src/commands/challenge.rs

@@ -91,11 +91,11 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
     };
     let author = ctx.author();
     let mut submitted_images = Vec::new();
-    for (i, submission) in submission_data.iter_mut().enumerate() {
+    for submission in submission_data.iter_mut() {
         if is_matching_submission(&submission, author) {
             existing_submitter = true;
             let mut images: Vec<String> = submission["images"].as_array_mut().unwrap().clone().iter().map(|value| value.as_str().unwrap().to_owned()).collect();
-            for attachment in attachments.iter() {
+            for (i, attachment) in attachments.iter().enumerate() {
                 let extension;
                 if let Some(content_type) = &attachment.content_type {
                     if content_type == "image/png" {
@@ -112,11 +112,12 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
                 }
                 requires_rebuild = true;
                 let file_name = format!(
-                    "{}-{}-{}-{}.{}",
+                    "{}-{}-{}-{}{}.{}",
                     i + 1,
                     slugify(&author.name),
                     author.discriminator,
                     timestamp,
+                    if i == 0 { "".to_owned() } else { format!("-{}", i + 1) },
                     extension
                 );
                 images.push(file_name.clone().into());
@@ -138,7 +139,7 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
             format!("{}#{}", author.name, author.discriminator).into(),
         );
         let mut images: Vec<String> = Vec::new();
-        for attachment in attachments.iter() {
+        for (i, attachment) in attachments.iter().enumerate() {
             let extension;
             if let Some(content_type) = &attachment.content_type {
                 if content_type == "image/png" {
@@ -155,11 +156,12 @@ pub async fn submit(ctx: Context<'_>, submission: serenity::Attachment) -> Resul
             }
             requires_rebuild = true;
             let file_name = format!(
-                "{}-{}-{}-{}.{}",
+                "{}-{}-{}-{}{}.{}",
                 submission_data.len() + 1,
                 slugify(&author.name),
                 author.discriminator,
                 timestamp,
+                if i == 0 { "".to_owned() } else { format!("-{}", i + 1) },
                 extension
             );
             images.push(file_name.clone().into());