add unicode convertion

extension.js

@@ -58,6 +58,8 @@ const commandNameFunctionMap = {
   duplicateAndIncrement: (str) => str + increment(str),
   duplicateAndDecrement: (str) => str + decrement(str),
   sequence,
+  utf8ToChar: (str) => str.match(/\\u[\dA-Fa-f]{4}/g).map((x) => x.slice(2)).map((x) => String.fromCharCode(parseInt(x, 16))).join(""),
+  charToUtf8: (str) => str.split("").map((x) => `\\u${x.charCodeAt(0).toString(16).padStart(4, '0')}`).join(""),
 };
 const numberFunctionNames = [
   "increment",

package.json

@@ -185,6 +185,16 @@
 				"title": "Sequence all numbers (starting with first number)",
 				"category": "String Manipulation",
 				"command": "string-manipulation.sequence"
+			},
+			{
+				"title": "Convert char to UTF8",
+				"category": "String Manipulation",
+				"command": "string-manipulation.charToUtf8"
+			},
+			{
+				"title": "Convert UTF8 to char",
+				"category": "String Manipulation",
+				"command": "string-manipulation.utf8ToChar"
 			}
 		],
 		"submenus": [
@@ -308,6 +318,14 @@
 				{
 					"command": "string-manipulation.sequence",
 					"group": "7_modification"
+				},
+				{
+					"command": "string-manipulation.utf8ToChar",
+					"group": "7_modification"
+				},
+				{
+					"command": "string-manipulation.charToUtf8",
+					"group": "7_modification"
 				}
 			]
 		}

test/suite/extension.test.js

@@ -95,6 +95,8 @@ suite("Extension Test Suite", () => {
       "a14 b15 c16\n17d 18e 19f 20x y21 22z23",
     ],
     ["sequence", "-3 4 5 6 7", "-3 -2 -1 0 1"],
+    ["utf8ToChar", "\\u0061\\u0062\\u0063\\u4e2d\\u6587\\ud83d\\udc96", "abc中文💖"],
+    ["charToUtf8", "abc中文💖", "\\u0061\\u0062\\u0063\\u4e2d\\u6587\\ud83d\\udc96"],
   ];
   suite("commandNameFunctionMap outputs correctly for all methods", () => {
     tests.forEach(