implemented payables

Author: Lovegupta112

.deps/npm/@openzeppelin/contracts/utils/Panic.sol

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/Panic.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Helper library for emitting standardized panic codes.
+ *
+ * ```solidity
+ * contract Example {
+ *      using Panic for uint256;
+ *
+ *      // Use any of the declared internal constants
+ *      function foo() { Panic.GENERIC.panic(); }
+ *
+ *      // Alternatively
+ *      function foo() { Panic.panic(Panic.GENERIC); }
+ * }
+ * ```
+ *
+ * Follows the list from https://github.com/ethereum/solidity/blob/v0.8.24/libsolutil/ErrorCodes.h[libsolutil].
+ *
+ * _Available since v5.1._
+ */
+// slither-disable-next-line unused-state
+library Panic {
+    /// @dev generic / unspecified error
+    uint256 internal constant GENERIC = 0x00;
+    /// @dev used by the assert() builtin
+    uint256 internal constant ASSERT = 0x01;
+    /// @dev arithmetic underflow or overflow
+    uint256 internal constant UNDER_OVERFLOW = 0x11;
+    /// @dev division or modulo by zero
+    uint256 internal constant DIVISION_BY_ZERO = 0x12;
+    /// @dev enum conversion error
+    uint256 internal constant ENUM_CONVERSION_ERROR = 0x21;
+    /// @dev invalid encoding in storage
+    uint256 internal constant STORAGE_ENCODING_ERROR = 0x22;
+    /// @dev empty array pop
+    uint256 internal constant EMPTY_ARRAY_POP = 0x31;
+    /// @dev array out of bounds access
+    uint256 internal constant ARRAY_OUT_OF_BOUNDS = 0x32;
+    /// @dev resource error (too large allocation or too large array)
+    uint256 internal constant RESOURCE_ERROR = 0x41;
+    /// @dev calling invalid internal function
+    uint256 internal constant INVALID_INTERNAL_FUNCTION = 0x51;
+
+    /// @dev Reverts with a panic code. Recommended to use with
+    /// the internal constants with predefined codes.
+    function panic(uint256 code) internal pure {
+        assembly ("memory-safe") {
+            mstore(0x00, 0x4e487b71)
+            mstore(0x20, code)
+            revert(0x1c, 0x24)
+        }
+    }
+}

.deps/npm/@openzeppelin/contracts/utils/Strings.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.1.0) (utils/Strings.sol)
+
+pragma solidity ^0.8.20;
+
+import {Math} from "./math/Math.sol";
+import {SignedMath} from "./math/SignedMath.sol";
+
+/**
+ * @dev String operations.
+ */
+library Strings {
+    bytes16 private constant HEX_DIGITS = "0123456789abcdef";
+    uint8 private constant ADDRESS_LENGTH = 20;
+
+    /**
+     * @dev The `value` string doesn't fit in the specified `length`.
+     */
+    error StringsInsufficientHexLength(uint256 value, uint256 length);
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
+     */
+    function toString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            uint256 length = Math.log10(value) + 1;
+            string memory buffer = new string(length);
+            uint256 ptr;
+            assembly ("memory-safe") {
+                ptr := add(buffer, add(32, length))
+            }
+            while (true) {
+                ptr--;
+                assembly ("memory-safe") {
+                    mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
+                }
+                value /= 10;
+                if (value == 0) break;
+            }
+            return buffer;
+        }
+    }
+
+    /**
+     * @dev Converts a `int256` to its ASCII `string` decimal representation.
+     */
+    function toStringSigned(int256 value) internal pure returns (string memory) {
+        return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
+     */
+    function toHexString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            return toHexString(value, Math.log256(value) + 1);
+        }
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
+     */
+    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
+        uint256 localValue = value;
+        bytes memory buffer = new bytes(2 * length + 2);
+        buffer[0] = "0";
+        buffer[1] = "x";
+        for (uint256 i = 2 * length + 1; i > 1; --i) {
+            buffer[i] = HEX_DIGITS[localValue & 0xf];
+            localValue >>= 4;
+        }
+        if (localValue != 0) {
+            revert StringsInsufficientHexLength(value, length);
+        }
+        return string(buffer);
+    }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
+     * representation.
+     */
+    function toHexString(address addr) internal pure returns (string memory) {
+        return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
+    }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its checksummed ASCII `string` hexadecimal
+     * representation, according to EIP-55.
+     */
+    function toChecksumHexString(address addr) internal pure returns (string memory) {
+        bytes memory buffer = bytes(toHexString(addr));
+
+        // hash the hex part of buffer (skip length + 2 bytes, length 40)
+        uint256 hashValue;
+        assembly ("memory-safe") {
+            hashValue := shr(96, keccak256(add(buffer, 0x22), 40))
+        }
+
+        for (uint256 i = 41; i > 1; --i) {
+            // possible values for buffer[i] are 48 (0) to 57 (9) and 97 (a) to 102 (f)
+            if (hashValue & 0xf > 7 && uint8(buffer[i]) > 96) {
+                // case shift by xoring with 0x20
+                buffer[i] ^= 0x20;
+            }
+            hashValue >>= 4;
+        }
+        return string(buffer);
+    }
+
+    /**
+     * @dev Returns true if the two strings are equal.
+     */
+    function equal(string memory a, string memory b) internal pure returns (bool) {
+        return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
+    }
+}