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30Day-Strings.sol

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+//SPDX-License-Identifier: GPL-3.0
+
+pragma solidity >=0.5.0 <0.9.0;
+
+contract Day6 {
+    function length(string memory str) public pure returns (uint256) {
+        bytes memory str_bytes = bytes(str);
+        return str_bytes.length;
+    }
+//concatenate ( ) - This function will take two arguments i.e string 1 and string 2. It will concatenate string 1 and string 2 and will return the concatenated string.
+    function concatenate(string memory str1, string memory str2)
+        public
+        pure
+        returns (string memory)
+    {
+        bytes memory str_bytes1 = bytes(str1);
+        bytes memory str_bytes2 = bytes(str2);
+        string memory str = new string(str_bytes1.length + str_bytes2.length);
+        bytes memory str_bytes = bytes(str);
+
+        uint256 k = 0;
+        for (uint256 i = 0; i < str_bytes1.length; i++) {
+            str_bytes[k] = str_bytes1[i];
+            k++;
+        }
+        for (uint256 i = 0; i < str_bytes2.length; i++) {
+            str_bytes[k] = str_bytes2[i];
+            k++;
+        }
+
+        return string(str_bytes);
+    }
+}