Contract Source Code:

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.7.6;

contract MultiCallHelper {
  fallback () external payable {
    assembly {
      for { let ptr := 0 } lt(ptr, calldatasize()) {} {
        let to := calldataload(ptr)
        ptr := add(ptr, 32)

        let value := calldataload(ptr)
        ptr := add(ptr, 32)

        let inSize := calldataload(ptr)
        ptr := add(ptr, 32)

        calldatacopy(0, ptr, inSize)
        ptr := add(ptr, inSize)

        let success := call(gas(), to, value, 0, inSize, 0, 0)
        if iszero(success) {
          returndatacopy(0, 0, returndatasize())
          revert(0, returndatasize())
        }
      }
      stop()
    }
  }
}