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🅖🅡🅘🅝🅒🅗 🅘🅝🅤

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⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣷⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣼⣿⣷⠀⠀⢀⣀⣤⡤⠤⠤⠤⠤⣀⡀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣴⣿⠟⢹⣿⣤⡶⠛⠉⠀⠀⠀⠀⠀⠀⠀⠈⠑⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣶⣿⠟⠁⢀⣿⣿⠋⣀⣀⣤⡤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣶⣿⣿⠟⠃⠀⣠⣾⣿⣿⠿⢛⣿⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣴⣾⠿⠛⢉⠔⠁⠀⠀⠼⠟⠋⠉⠀⣠⣾⠟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⣶⡿⠟⠉⠀⠀⣠⠊⠀⠀⠀⠀⠀⠀⠀⢀⣼⣿⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣶⣿⠟⠉⠀⠀⠀⠀⠀⠃⠀⠀⠀⠀⠀⠀⠀⣠⣿⣿⣷⣦⣤⣤⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⣾⡿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⣾⡿⠋⠁⠈⠙⢿⣯⡙⠳⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣴⣿⠟⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⣶⣿⠟⠉⠀⠀⠀⠀⠀⠀⠹⣷⡄⠈⠙⣦⡀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣼⣿⡏⠀⠀⠀⠀⠀⠀⠀⠠⠤⣶⣶⡿⠿⠿⠛⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⠀⠀⠈⠳⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⡆⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠐⠒⠒⠲⠶⢶⣾⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⣿⣧⡀⠀⠀⠀⣀⠀⠀⠀⠀
⠀⠀⠀⠀⠒⠒⠲⠦⢤⣭⣿⣿⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡠⠀⠀⠙⢿⣿⣶⣶⣿⡧⠤⠀⠀⠀
⠀⠀⠀⠀⢀⣠⣴⣶⠿⠿⠿⠿⣿⣷⣄⠀⠀⠀⠀⠀⠀⠀⢠⣤⣤⣄⡀⠀⠀⠀⠀⠀⠀⣠⣤⡴⠋⠀⠀⠀⣠⣾⣿⣿⣿⣷⣤⣤⣄⠀⠀
⠀⠀⢀⣴⣿⣿⣧⣤⡤⠄⠀⠀⠀⢉⣻⣷⣦⣀⡀⠀⠀⠀⠀⠀⠙⠳⢬⡁⠀⠀⠀⠀⣰⢣⠋⠀⠀⢀⣤⣾⣿⠟⠉⠠⠤⠶⢾⣿⣿⡿⠦
⠀⠀⢼⣿⣿⠿⠋⠁⠀⠀⠀⠀⠀⠒⠿⣿⣿⣿⣿⣷⣦⣄⣀⠀⠀⠀⠀⠙⣆⠀⠀⢠⠏⠁⢀⣠⣶⣿⡿⣿⠃⠀⠀⠀⠲⢾⣿⡛⠛⠿⣆
⠀⠀⣼⡿⠁⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⢿⣿⣟⠛⣿⠿⠿⣿⣶⣦⣀⠀⠈⠀⠀⣨⣴⣾⣿⡿⠋⠁⣠⡏⠀⠀⠀⠀⠀⠀⠙⢿⣦⡀⠀
⠀⢰⣿⣧⣾⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠙⠿⣿⣁⣀⣀⣀⣉⣙⣿⣷⣦⣴⣾⣿⣿⣭⣾⣧⣴⡾⠋⠀⠀⠀⠀⠀⠀⠀⠀⠈⣿⣷⠀
⠀⠘⣿⣿⣿⣿⠀⠀⠀⠀⣀⣤⣤⣶⣶⣶⣤⣤⣀⠈⠉⠙⠛⠋⠉⠉⢉⣩⣿⣿⣯⣍⡉⠉⠉⠉⣀⣴⠶⠿⠿⢿⡋⠂⠀⠀⠀⠀⢸⣿⡆
⠀⠀⠈⠻⣿⣿⡄⠀⠀⠀⠀⠀⠀⣿⡏⠀⠀⠀⠈⠉⠀⠀⠀⠀⠀⠀⠙⠛⠦⢤⣤⣽⠋⠀⠀⠈⠁⠀⠀⠀⠀⠈⣷⠀⠀⠀⠀⠀⢸⣿⡇
⠀⠀⠀⠀⠈⢻⣷⡀⠀⠀⠀⠀⠀⢹⣷⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢧⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⡏⠀⠀⠀⠀⠀⣼⣿⠀
⠀⠀⠀⠀⠀⠀⠻⣿⣄⠀⠀⠀⠀⠀⠙⢿⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣧⠀⠀⠀⠀⠀⠀⠀⢀⣿⠃⠀⠀⠀⠀⣼⣿⠃⠀
⠀⠀⠀⠀⠀⠀⠀⠙⢿⣷⣄⠀⠀⠀⠀⠈⠙⢷⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⠀⠀⠀⠀⠀⠀⢀⣾⠋⠀⠀⠀⣠⣾⡿⠃⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⢿⣶⣄⠀⠀⠀⠀⠀⠙⠿⣦⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⠂⠀⠀⠀⢀⣴⡿⠃⠀⠀⣠⣾⡿⠟⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠻⣷⣦⡀⠀⠀⠀⠀⠈⠙⠷⣦⣄⡀⠀⠀⠀⠀⠀⠀⣾⠀⠀⢀⣴⡿⠋⠀⢀⣤⣾⡿⠋⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠙⢿⣷⣤⡀⠀⠀⠀⠀⠀⠉⠛⠷⣶⣤⣄⣀⣠⣿⣴⣾⠟⠋⢀⣠⣶⣿⠟⠁⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⠀⠀⠈⠛⢿⣶⣄⠀⠀⠀⠀⠀⠀⠀⠀⠉⠙⠛⠋⢁⣠⣤⣾⣿⠿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⢀⣠⣶⠾⢟⣿⣿⣿⣿⣿⣿⣶⣦⣙⢿⣷⡄⠀⠀⠀⠀⠀⠀⠒⢲⣾⣿⠿⠟⣛⣉⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠴⠛⣡⣴⡿⠟⠋⠉⠉⠀⠀⠀⠀⠉⠻⣿⣿⣿⡄⠀⠀⠀⠀⠀⢠⣿⣿⣶⣾⣿⠿⠿⠷⠶⣶⣤⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⣠⣾⢟⣩⠀⠀⠀⠀⢀⣠⡴⠶⠶⠶⠶⣾⣿⣿⡇⠀⠀⠀⠀⢀⣿⣿⠟⠉⠀⠀⠀⠀⠀⠲⢶⣿⣿⣷⣄⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣰⣿⣿⣿⠇⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀⠉⠻⢿⣄⠀⠀⠀⠘⣿⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⠷⣌⠙⢷⡀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣿⣿⣿⡟⠀⠀⣠⡞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⣧⣤⠴⠾⠟⠛⠒⠀⠀⠀⠀⠀⠀⠀⠘⢦⣄⡙⣷⡌⠇⠀⠀⠀⠀⠀
⠀⠀⠀⢠⣿⣿⣿⡇⢀⣾⠟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠜⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⣿⣿⣿⡄⠀⠀⠀⠀⠀
⠀⠀⠀⢸⣿⡇⣿⡅⣾⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠐⣦⣄⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⡇⠀⠀⠀⠀⠀
⠀⠀⠀⣼⣿⠁⣿⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢻⣿⡿⢷⣦⣤⡀⠀⠀⠀⠀⠀⠀⣿⣿⣿⡇⠀⠀⠀⠀⠀
⠀⠀⠀⣿⣿⠀⢹⣿⣿⣿⣄⠀⠰⣄⠀⠀⠀⠀⠀⠀⠈⠲⣄⡀⠀⠀⠀⠀⠀⠀⠹⣿⣄⠈⠙⠻⣷⣤⡀⠀⠀⠀⣿⣿⣿⠃⠀⠀⠀⠀⠀
⠀⠀⢸⣿⡏⠀⠀⠻⠿⠻⣿⣦⡀⠘⢿⣦⣄⠀⠀⠀⠀⠀⠘⢿⣷⣤⣀⠀⠀⠀⠀⠹⣿⡄⠀⠀⠈⢻⣷⡀⠀⢠⣿⣿⡇⠀⠀⠀⠀⠀⠀
⠀⠀⣾⣿⠃⠀⠀⠀⠀⠀⠈⣿⣿⣶⣄⠻⣿⡿⣶⣤⣄⡀⠀⠀⠻⣿⣿⢷⣦⣀⠀⠀⣿⣷⠀⠀⠀⠀⣿⣷⣴⡿⠋⢿⣿⡄⠀⠀⠀⠀⠀
⠀⣰⣿⡏⠀⠀⠀⠀⠀⢀⣾⣿⠃⠈⠙⠛⠿⣷⣄⠉⠛⠻⢷⣦⣄⢹⣿⡄⠈⠛⢷⣤⣿⠏⠀⠀⠀⠀⣿⡿⠋⠀⠀⠈⢿⣿⡄⠀⠀⠀⠀
⢰⣿⡿⠀⠀⠀⠀⠀⠀⣾⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠛⠿⣿⣿⠀⠀⠀⠻⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢿⣿⠄⠀⠀⠀

𝑀𝑎𝑥 ℎ𝑎𝑠 𝑟𝑒𝑡𝑢𝑟𝑛𝑒𝑑 𝑡𝑜 𝑠𝑎𝑣𝑒 𝐶ℎ𝑟𝑖𝑠𝑡𝑚𝑎𝑠 𝑎𝑛𝑑 𝑐ℎ𝑎𝑛𝑔𝑒 𝑡ℎ𝑒 𝐺𝑟𝑖𝑛𝑐ℎ’𝑠 ℎ𝑒𝑎𝑟𝑡. 
𝐺𝑟𝑖𝑛𝑐ℎ 𝐼𝑛𝑢 𝑖𝑠 ℎ𝑒𝑟𝑒 𝑡𝑜 ℎ𝑒𝑙𝑝 𝑤𝑖𝑡ℎ 𝐶ℎ𝑟𝑖𝑠𝑡𝑚𝑎𝑠 𝑏𝑦 𝑏𝑙𝑒𝑠𝑠𝑖𝑛𝑔 𝑟𝑎𝑛𝑑𝑜𝑚 𝑏𝑢𝑦𝑒𝑟𝑠 𝑤𝑖𝑡ℎ 𝑡ℎ𝑒𝑖𝑟 𝑚𝑜𝑛𝑒𝑦 𝑏𝑎𝑐𝑘, 𝑑𝑜𝑢𝑏𝑙𝑒, 𝑡𝑟𝑖𝑝𝑙𝑒, 𝑜𝑟 𝑒𝑣𝑒𝑛 𝑚𝑜𝑟𝑒!
𝑊𝑒 𝑎𝑟𝑒 ℎ𝑒𝑟𝑒 𝑡𝑜 𝑤𝑟𝑖𝑡𝑒 𝑎 𝑛𝑒𝑤 𝑠𝑡𝑜𝑟𝑦 𝑜𝑛 ℎ𝑜𝑤 𝑀𝑎𝑥 𝑎𝑛𝑑 𝑇ℎ𝑒 𝐺𝑟𝑖𝑛𝑐ℎ 𝑠𝑎𝑣𝑒 𝐶ℎ𝑟𝑖𝑠𝑡𝑚𝑎𝑠 𝑖𝑛𝑠𝑡𝑒𝑎𝑑 𝑜𝑓 𝑠𝑡𝑒𝑎𝑙𝑖𝑛𝑔 𝑖𝑡!

𝑇𝑎𝑥𝑒𝑠 : 8|8

𝐵𝑟𝑒𝑎𝑘𝑑𝑜𝑤𝑛: 
4% 𝑜𝑛 𝑏𝑢𝑦𝑠 𝑎𝑛𝑑 𝑠𝑒𝑙𝑙𝑠 𝑔𝑜 𝑖𝑛𝑡𝑜 𝑡ℎ𝑒 “𝐺𝑖𝑣𝑖𝑛𝑔 𝐵𝑎𝑐𝑘” 𝑤𝑎𝑙𝑙𝑒𝑡. 𝑇ℎ𝑎𝑡 𝑚𝑜𝑛𝑒𝑦 𝑤𝑖𝑙𝑙 𝑏𝑒 𝑢𝑠𝑒𝑑 𝑡𝑜 𝑏𝑙𝑒𝑠𝑠 𝑟𝑎𝑛𝑑𝑜𝑚 𝑏𝑢𝑦𝑠 𝑡𝑜 ℎ𝑒𝑙𝑝 𝑤𝑖𝑡ℎ 𝐶ℎ𝑟𝑖𝑠𝑡𝑚𝑎𝑠. 𝑇ℎ𝑒𝑛, 4% 𝑜𝑛 𝑏𝑢𝑦𝑠 𝑎𝑛𝑑 𝑠𝑒𝑙𝑙𝑠 𝑤𝑖𝑙𝑙 𝑔𝑜 𝑖𝑛𝑡𝑜 𝑡ℎ𝑒 𝑚𝑎𝑟𝑘𝑒𝑡𝑖𝑛𝑔/𝑡𝑒𝑎𝑚 𝑤𝑎𝑙𝑙𝑒𝑡.

𝑱𝒐𝒊𝒏 𝒖𝒔 𝒂𝒔 𝒘𝒆 𝒉𝒆𝒍𝒑 𝒔𝒂𝒗𝒆 𝑪𝒉𝒓𝒊𝒔𝒕𝒎𝒂𝒔❗


𝑻𝑮 | 𝒉𝒕𝒕𝒑𝒔://𝒕.𝒎𝒆/𝑮𝒓𝒊𝒏𝒄𝒉_𝒊𝒏𝒖_𝑪𝒉𝒂𝒏𝒏𝒆𝒍

𝑻𝒘𝒊𝒕𝒕𝒆𝒓 | 𝒉𝒕𝒕𝒑𝒔://𝒕𝒘𝒊𝒕𝒕𝒆𝒓.𝒄𝒐𝒎/𝒊𝒏𝒖_𝒈𝒓𝒊𝒏𝒄𝒉1

𝑴𝒆𝒅𝒊𝒖𝒎 | 𝒉𝒕𝒕𝒑𝒔://𝒎𝒆𝒅𝒊𝒖𝒎.𝒄𝒐𝒎/@𝑮𝒓𝒊𝒏𝒄𝒉_𝑰𝒏𝒖



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⬜⬜⬜⬜⬜⬜⬜⬛⬜⬛🟩🟩🟩🟩⬛⬜⬜⬜⬜⬛⬛⬛🟥⬛⬜⬜⬜⬛⬜⬜⬜⬛
⬜⬜⬜⬜⬜⬜⬜⬜⬛🟩🟩🟩🟩🟩🟩⬛⬜⬜⬜⬜⬜⬜⬛⬛⬛⬜⬜⬛⬜⬜⬜⬛
⬜⬜⬜⬜⬜⬜⬜⬜⬛🟩🟩🟩🟩🟩🟩🟩⬛⬜⬜⬜⬜⬜⬜⬜⬜⬛⬜⬛⬜⬜⬜⬛
⬜⬜⬜⬜⬜⬛⬛⬛🟩🟩🟩🟩🟩🟩🟩🟩🟩⬛⬛⬛⬛⬛⬛⬛⬛⬛⬜⬜⬛⬛⬛⬜
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⬛🟩🟩🟩⬛⬜⬜🟩🟩🟩🟩🟩⬛⬛⬛🟩🟩🟩⬛⬛⬛🟩🟩🟩⬛⬜⬜⬛⬛🟩🟩⬛
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⬜⬜⬜⬜⬜⬜⬜⬛⬛⬛🟩🟩🟩⬛🟩🟩🟩🟩⬛🟩🟩🟩⬛⬛⬜⬜⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬛⬛🟩🟩⬛⬛⬛⬛🟩🟩⬛⬛⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬛🟩🟩⬛⬛🟩🟩⬛⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬛🟩🟩🟩🟩⬛⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬛⬛⬛⬛⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜

*/




pragma solidity 0.8.4;

// SPDX-License-Identifier: Apache-2.0

interface IERC20 {
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            codehash := extcodehash(account)
        }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(
            data
        );
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() external virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) external virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

// pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

// pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

// pragma solidity >=0.6.2;

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

contract GrinchInu2 is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    mapping(address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _isExcludedFromMaxTx;

    uint256 private _totalSupply = 100000000000 * 10**9;

    string private _name = "Grinch Inu";
    string private _symbol = "$GI";
    uint8 private _decimals = 9;

    uint256 public _devFee = 8;
    uint256 private _previousDevFee = _devFee;

    address payable private _devWalletAddress =
        payable(0x76838EBf0aE49A16635dAA1Ff6853E00b9f648F5);

    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    bool currentlySwapping;
    bool public swapAndRedirectEthFeesEnabled = true;

    uint256 private tokensSoldThresholdForEthSwap = 10000000 * 10**9;
    
    uint256 public maxTxAmount = _totalSupply.mul(50).div(1000); // 5%

    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndRedirectEthFeesUpdated(bool enabled);
    event OnSwapAndRedirectEthFees(
        uint256 tokensSwapped,
        uint256 ethToDevWallet
    );

    modifier lockTheSwap() {
        currentlySwapping = true;
        _;
        currentlySwapping = false;
    }

    constructor() {
        _balances[_msgSender()] = _totalSupply;

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        // Create a uniswap pair for this new token
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        // set the rest of the contract variables
        uniswapV2Router = _uniswapV2Router;

        // exclude owner and this contract from fee
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        
        // internal exclude from max tx
        _isExcludedFromMaxTx[owner()] = true;
        _isExcludedFromMaxTx[address(this)] = true;

        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount)
        public
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
        public
        view
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].add(addedValue)
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        
        if (
            !_isExcludedFromMaxTx[from] &&
            !_isExcludedFromMaxTx[to] // by default false
        ) {
            require(
                amount <= maxTxAmount,
                "Transfer amount exceeds the maxTxAmount"
            );
        }

        // start swap to ETH
        uint256 contractTokenBalance = balanceOf(address(this));
        bool overMinTokenBalance = contractTokenBalance >=
            tokensSoldThresholdForEthSwap;
        if (
            overMinTokenBalance &&
            !currentlySwapping &&
            from != uniswapV2Pair &&
            swapAndRedirectEthFeesEnabled
        ) {
            // add dev fee
            swapAndRedirectEthFees(contractTokenBalance);
        }

        // transfer amount
        _tokenTransfer(from, to, amount);
    }

    //this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) private {
        if (_isExcludedFromFee[sender] || _isExcludedFromFee[recipient]) {
            removeAllFee();
        }

        (uint256 tTransferAmount, uint256 tDev) = _getValues(amount);
        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(tTransferAmount);
        _takeDevFee(tDev);

        if (_isExcludedFromFee[sender] || _isExcludedFromFee[recipient]) {
            restoreAllFee();
        }

        emit Transfer(sender, recipient, tTransferAmount);
    }

    //to recieve ETH from uniswapV2Router when swaping
    receive() external payable {}

    function _getValues(uint256 tAmount)
        private
        view
        returns (uint256, uint256)
    {
        uint256 tDev = calculateDevFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tDev);
        return (tTransferAmount, tDev);
    }

    function _takeDevFee(uint256 devFee) private {
        _balances[address(this)] = _balances[address(this)].add(devFee);
    }

    function calculateDevFee(uint256 _amount)
        private
        view
        returns (uint256)
    {
        return _amount.mul(_devFee).div(100);
    }

    function removeAllFee() private {
        if (_devFee == 0) return;

        _previousDevFee = _devFee;

        _devFee = 0;
    }

    function restoreAllFee() private {
        _devFee = _previousDevFee;
    }

    function isExcludedFromFee(address account) external view returns (bool) {
        return _isExcludedFromFee[account];
    }

    function swapAndRedirectEthFees(uint256 contractTokenBalance)
        private
        lockTheSwap
    {
        // capture the contract's current ETH balance.
        // this is so that we can capture exactly the amount of ETH that the
        // swap creates, and not make the fee events include any ETH that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for ETH
        swapTokensForEth(contractTokenBalance);

        uint256 newBalance = address(this).balance.sub(initialBalance);

        if (newBalance > 0) {
            //
            // send to dev wallet
            //
            sendEthToDevWallet(newBalance);

            emit OnSwapAndRedirectEthFees(contractTokenBalance, newBalance);
        }
    }

    function sendEthToDevWallet(uint256 amount) private {
        _devWalletAddress.transfer(amount);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function manualSwap() external onlyOwner {
        uint256 contractBalance = balanceOf(address(this));
        swapTokensForEth(contractBalance);
    }

    function manualSend() external onlyOwner {
        uint256 contractEthBalance = address(this).balance;
        sendEthToDevWallet(contractEthBalance);
    }
    
    // for 0.5% input 5, for 1% input 10
    function setMaxTxPercent(uint256 newMaxTx) public onlyOwner {
        require(newMaxTx >= 5, "Max TX should be above 0.5%");
        maxTxAmount = _totalSupply.mul(newMaxTx).div(1000);
    }

    function excludeFromFee(address account) external onlyOwner {
        _isExcludedFromFee[account] = true;
    }

    function includeInFee(address account) external onlyOwner {
        _isExcludedFromFee[account] = false;
    }

    function setDevFee(uint256 fee) external onlyOwner {
        require(fee <= 10, "Amount exceeds maximum allowed fee");
        _devFee = fee;
    }

    function _setDevWallet(address payable newDevWallet)
        external
        onlyOwner
    {
        _devWalletAddress = newDevWallet;
    }

    function setRouterAddress(address newRouter) external onlyOwner {
        IUniswapV2Router02 _newUniswapRouter = IUniswapV2Router02(newRouter);
        uniswapV2Pair = IUniswapV2Factory(_newUniswapRouter.factory())
            .createPair(address(this), _newUniswapRouter.WETH());
        uniswapV2Router = _newUniswapRouter;
    }

    function setSwapAndRedirectEthFeesEnabled(bool enabled) external onlyOwner {
        swapAndRedirectEthFeesEnabled = enabled;
        emit SwapAndRedirectEthFeesUpdated(enabled);
    }
}