implement usdc converter contract

Cargo.toml

@@ -11,6 +11,7 @@ members = [
     "contracts/cw20-merkle-airdrop",
     "contracts/price-feed",
     "contracts/astroport/*",
+    "contracts/usdc-converter",
 ]
 
 [profile.release]

contracts/usdc-converter/.gitignore

@@ -0,0 +1,15 @@
+# Build results
+/target
+
+# Cargo+Git helper file (https://github.com/rust-lang/cargo/blob/0.44.1/src/cargo/sources/git/utils.rs#L320-L327)
+.cargo-ok
+
+# Text file backups
+**/*.rs.bk
+
+# macOS
+.DS_Store
+
+# IDEs
+*.iml
+.idea

contracts/usdc-converter/Cargo.toml

@@ -0,0 +1,34 @@
+[package]
+authors = ["Sergei Sotnikov <ssotnikov93@gmail.com>"]
+description = "A contract for NTRN<>USDC.axl LP tokens conversion to NTRN and Noble USDC native assets, providing them to the pair and staking them to Astroport incentives"
+edition = "2021"
+name = "usdc-converter"
+repository = "https://github.com/neutron-org/neutron-tge-contracts"
+version = "0.1.0"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+# for more explicit tests, cargo test --features=backtraces
+backtraces = ["cosmwasm-std/backtraces"]
+# use library feature to disable all instantiate/execute/query exports
+library = []
+
+[dependencies]
+cosmwasm-schema = { version = "1.3.0" }
+cosmwasm-std = { version = "1.3.0" }
+cosmwasm-storage = { version = "1.3.0" }
+cw-controllers = "1.1.0"
+cw-storage-plus = "1.1.0"
+cw-utils = { version = "1.0.1" }
+cw2 = "1.1.0"
+cw20 = { workspace = true }
+schemars = "0.8.8"
+serde = { version = "1.0.175", default-features = false, features = ["derive"] }
+thiserror = { version = "1.0" }
+astroport = { path = "../../packages/astroport" }
+
+[dev-dependencies]
+anyhow = "1.0.57"
+cw-multi-test = "0.16.5"

contracts/usdc-converter/README.md

@@ -0,0 +1,41 @@
+### USDC converter contract
+
+This contract is designed to facilitate Lockdrop participants migration to Noble USDC. It's only `ConvertAndStake` `Receive` handler processes the following operations:
+1. Making a `WithdrawLiquidity` call to the `NTRN<>USDC.axl` pair using a given amount of LP tokens;
+2. Swapping the withdrawn USDC.axl to Noble USDC;
+3. Making a `ProvideLiquidity` call to the `NTRN<>USDC` pair using the withdrawn amount of NTRN and swapped amount of USDC.
+
+### Call example
+
+Here's a `ConvertAndStake` message run on a mainnet fork explanation:
+```json
+{
+  "messages": [
+    {
+      "@type": "/cosmwasm.wasm.v1.MsgExecuteContract",
+      "sender": "neutron1kyn3jx88wvnm3mhnwpuue29alhsatwzrpkwhu6",
+      "contract": "neutron137rzkacryzstfyylvvvu2vq9uj5l89yzx9v7gxp0s77xq5ach2xs3t6t3p",
+      "msg": {
+        "send": {
+          "contract": "neutron1zqskhhcn3t45q6y6ljly6nnwreyjw92ejpewc6aj4cfsuyj8mpxsfnxp56",
+          "amount": "10000000",
+          "msg": "eyJjb252ZXJ0X2FuZF9zdGFrZSI6eyJ0cmFuc211dGVyX3Bvb2wiOiJuZXV0cm9uMW5zMnRjdW5ybHJrNXlrNjJmcGw3NHljYXphbmNleWZtbXE3ZGxqNnNxOG4wcm5rdXZrN3N6c3RreXgiLCJub2JsZV9wb29sIjoibmV1dHJvbjFxM3JmbWZsaHA3OXJ6MHNkanhkZ2Y3dDN4NXR3Y2U5YXo2bjBmZWdzcGtqc3RyYXg0MmtxMGc5NnJuIiwibm9ibGVfdXNkY19kZW5vbSI6ImliYy9CNTU5QTgwRDYyMjQ5QzhBQTA3QTM4MEUyQTJCRUE2RTVDQTlBNkYwNzlDOTEyQzNBOUU5QjQ5NDEwNUU0RjgxIiwicHJvdmlkZV9saXF1aWRpdHlfc2xpcHBhZ2VfdG9sZXJhbmNlIjoiMC4wMSJ9fQ=="
+        }
+      },
+      "funds": []
+    }
+  ]
+}
+```
+
+where the decoded message is
+```json
+{
+  "convert_and_stake": {
+    "transmuter_pool": "neutron1ns2tcunrlrk5yk62fpl74ycazanceyfmmq7dlj6sq8n0rnkuvk7szstkyx",
+    "noble_pool": "neutron1q3rfmflhp79rz0sdjxdgf7t3x5twce9az6n0fegspkjstrax42kq0g96rn",
+    "noble_usdc_denom": "ibc/B559A80D62249C8AA07A380E2A2BEA6E5CA9A6F079C912C3A9E9B494105E4F81",
+    "provide_liquidity_slippage_tolerance": "0.01"
+  }
+}
+```