Making Smart Contract Development More Secure and Easier[C] PROCEEDINGS OF THE 29TH ACM JOINT MEETING ON EUROPEAN SOFTWARE ENGINEERING CONFERENCE AND SYMPOSIUM ON THE FOUNDATIONS OF SOFTWARE ENGINEERING (ESEC/FSE '21) 2021 Ren, Meng Ma, Fuchen Yin, Zijing Fu, Ying Li, Huizhong Chang, Wanli Jiang, Yu