add hello-world exercise + format config.json

exercises/practice/hello-world/.docs/instructions.md

@@ -0,0 +1,16 @@
+# Instructions
+
+The classical introductory exercise.
+Just say "Hello, World!".
+
+["Hello, World!"][hello-world] is the traditional first program for beginning programming in a new language or environment.
+
+The objectives are simple:
+
+- Modify the provided code so that it produces the string "Hello, World!".
+- Run the test suite and make sure that it succeeds.
+- Submit your solution and check it at the website.
+
+If everything goes well, you will be ready to fetch your first real exercise.
+
+[hello-world]: https://en.wikipedia.org/wiki/%22Hello,_world!%22_program

exercises/practice/hello-world/.meta/config.json

@@ -0,0 +1,20 @@
+{
+  "authors": [
+    "misicnenad"
+  ],
+  "files": {
+    "solution": [
+      "src/lib.cairo",
+      "Scarb.toml"
+    ],
+    "test": [
+      "src/tests.cairo"
+    ],
+    "example": [
+      ".meta/example.cairo"
+    ]
+  },
+  "blurb": "Exercism's classic introductory exercise. Just say \"Hello, World!\".",
+  "source": "This is an exercise to introduce users to using Exercism",
+  "source_url": "https://en.wikipedia.org/wiki/%22Hello,_world!%22_program"
+}

exercises/practice/hello-world/.meta/example.cairo

@@ -0,0 +1,3 @@
+fn hello() -> ByteArray {
+    "Hello, World!"
+}

exercises/practice/hello-world/.meta/tests.toml

@@ -0,0 +1,13 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[af9ffe10-dc13-42d8-a742-e7bdafac449d]
+description = "Say Hi!"

exercises/practice/hello-world/Scarb.toml

@@ -0,0 +1,4 @@
+[package]
+name = "hello_world"
+version = "0.1.0"
+edition = "2023_11"

exercises/practice/hello-world/src/lib.cairo

@@ -0,0 +1,4 @@
+// ByteArray is a string that's not limited to 31 characters, you'll learn more about this later
+fn hello() -> ByteArray {
+    "Goodbye, Mars!"
+}

exercises/practice/hello-world/src/tests.cairo

@@ -0,0 +1,7 @@
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn hello_world() {
+        assert_eq!(hello_world::hello(), "Hello, World!");
+    }
+}