kt: add «1910. Remove All Occurrences of a Substring»

URL:	https://leetcode.com/problems/remove-all-occurrences-of-a-substring/
Signed-off-by: Matej Focko <me@mfocko.xyz>

kt/remove-all-occurrences-of-a-substring.kt

@@ -0,0 +1,14 @@
+class Solution {
+    fun removeOccurrences(
+        s: String,
+        part: String,
+    ): String =
+        s.fold(StringBuilder(s.length)) { res, c ->
+            res.append(c)
+            if (res.endsWith(part)) {
+                res.deleteRange(res.length - part.length, res.length)
+            }
+
+            res
+        }.toString()
+}