Fix contract input handling

src/utils/helpers/is2DArray.ts

@@ -1,10 +0,0 @@
-export function isArray(arr: unknown): arr is unknown[] {
-  return Array.isArray(arr);
-}
-
-// Checks whether an array is a 2D array.
-// For this, a 2D array is an array which contains only other arrays.
-// If one element in the array is a number or string, it is NOT a 2D array
-export function is2DArray(arr: unknown): arr is unknown[][] {
-  return isArray(arr) && arr.every((u) => isArray(u));
-}