add 1768 ts solution

JeremyXXXuuu · JeremyXXXuuu · commit 695011c05021 · 2023-02-21T10:24:57.000+01:00
diff --git a/Problems/22-Merge-Strings-Alternately/1768.ts b/Problems/22-Merge-Strings-Alternately/1768.ts
@@ -0,0 +1,18 @@
+function mergeAlternately(word1: string, word2: string): string {
+  let ptr1: number = 0;
+  let ptr2: number = 0;
+  const len1 = word1.length;
+  const len2 = word2.length;
+  let res: string[] = [];
+  while (ptr1 < len1 || ptr2 < len2) {
+    if (ptr1 < len1 && ptr2 < len2) {
+      res.push(word1[ptr1++]);
+      res.push(word2[ptr2++]);
+    } else if (ptr1 > len1 || ptr2 < len2) {
+      res.push(word2[ptr2++]);
+    } else if (ptr1 < len1 || ptr2 > len2) {
+      res.push(word1[ptr1++]);
+    }
+  }
+  return res.join("");
+}
