Pointer arithmetic guide

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡰⠋⠉⠙⣟⠻⣶⢄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠴⠒⣆⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣼⣁⣤⠤⠄⠚⠳⠈⢢⠙⢦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣤⣶⣊⣁⠀⠀⠘⡆⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⣰⡟⠉⣠⠟⠁⠀⠀⣀⠠⣵⡀⠉⢉⣭⡽⠛⠉⠁⠀⠁⠑⠒⠲⠤⣀⠀⢀⠤⢲⡿⠫⠟⢋⡟⠁⠀⠀⠀⠸⡀
⠀⠀⠀⠀⠀⠀⠀⠀⢠⡏⢠⡞⣥⢄⡤⠒⠉⠀⠀⢀⡭⢤⡞⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⠄⠉⠥⡔⠁⠀⠀⠀⠈⠉⢉⡽⠆⠀⠀⢇
⠀⠀⠀⠀⠀⠀⠀⠀⣼⡇⠀⡠⠛⡪⠂⠀⢀⠀⡰⠃⣰⡟⠁⠀⠀⠀⠀⠀⠀⠀⠀⡴⠋⢠⠀⠀⠀⠙⢤⡄⠀⠀⠀⠸⣷⠄⠀⠀⠀⢸
⠀⠀⠀⠀⠀⠀⠀⠀⣿⣠⠊⢠⠞⠀⠀⢠⠋⡸⠁⡼⡇⠀⠀⠀⠀⠀⠀⠀⠀⢠⠊⠀⣠⠃⡄⠀⠀⠀⢄⠘⣦⡀⠀⠀⠘⡆⠀⠀⠀⢸
⠀⠀⠀⠀⠀⠀⠀⣰⢟⠅⡠⠃⡄⠀⢠⠇⠀⠁⡜⢀⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡴⢹⠀⡃⠀⠀⠀⢸⡄⠀⠙⢆⢢⣸⠇⠀⠀⠀⠸
⠀⠀⠀⠀⠀⢀⠜⢡⣫⡾⠁⡜⠀⢀⣾⠀⠀⡜⠐⢸⠀⡀⠀⠀⠀⠀⠀⠀⠀⣠⡟⠁⠈⡾⣇⠀⠀⡄⠐⣿⡀⠀⠈⠉⠙⣆⠀⠀⠀⢄
⠀⠀⠀⠀⡴⠋⣰⠟⢡⠃⢰⠁⢠⠏⢹⠀⡼⠀⣀⣨⡟⠉⠀⠀⠀⠀⠀⠈⣻⠟⠲⢤⡀⣇⣿⡀⠀⢱⠀⢹⣧⠀⠀⠀⠀⢻⣆⠀⠀⠀
⠀⠀⢀⣾⠟⣿⠏⠀⡎⢀⡇⠀⡞⢂⣼⣼⡗⠛⠉⠀⢧⠀⠀⠀⠀⠀⢰⢠⠃⠀⠀⠀⠈⢻⣧⣧⠀⠈⡆⠘⣿⡀⠀⠀⠀⠀⠏⠆⠀⠀
⠀⣠⣿⠏⣰⡏⠀⠀⣇⡾⡁⡸⠀⠀⠀⠙⠓⠀⠐⠒⠺⣧⡀⠀⠀⢠⣿⡏⠀⠀⠄⠀⠀⠘⣿⠘⡆⠀⡇⠀⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀
⣰⣿⡏⠀⢿⡇⠀⠀⣿⢀⣷⡇⠀⢀⣀⡀⣀⣀⣀⢀⡀⠈⠛⢄⡀⡼⣿⠀⠠⠤⢀⣀⠀⠀⠹⡇⠹⡀⢃⠀⢸⠆⠀⠀⠀⠀⠀⠀⠀⠀
⡏⡼⠀⠀⣸⠁⠀⠀⠙⣺⣈⣳⣶⣞⣛⣋⣉⠉⠻⡿⠋⠀⠀⠀⠈⠉⠩⠄⢠⣴⡾⠷⠾⣵⣄⡹⣄⣣⣾⠀⢸⠀⠀⡀⠀⠀⠀⠀⠀⠀
⣸⠁⠀⠀⡇⠀⠀⢀⠄⡏⠻⢯⣈⣦⣤⡽⣍⠤⣶⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠦⣙⣦⣄⡠⠭⣿⣿⣿⢹⡄⠂⠀⢰⠃⠀⠀⠀⠀⠀⠀
⠃⠀⠀⢸⠀⠀⠀⡜⢸⡇⠀⠀⠉⠉⢉⣀⢤⡴⠛⠒⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠲⣀⡛⠁⠽⠿⡇⠀⢠⠇⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⡞⠀⠀⣰⢃⣾⠆⠀⠀⠀⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠁⠀⠀⡼⠀⢀⠎⠀⠀⠀⡞⠀⠀⠀⠀
⠀⠀⢠⡇⠀⠀⣟⣼⢹⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⠃⢀⠎⠀⠀⠀⢸⣧⠀⠀⠀⠀
⠀⠀⣾⠁⠀⢠⣿⡏⢹⠀⠀⠀⠀⠀⠀⠀⠀⢀⡴⠋⣥⣤⣄⣉⡓⢤⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠇⢠⠏⠀⠀⡄⢀⠋⠻⡇⠀⠀⠀
⠀⢰⣿⠀⠀⢘⣿⣿⣼⡀⠀⠀⠀⠀⠀⠀⠀⢸⣧⣀⣿⣿⣿⣿⣿⣷⣟⣦⠀⠀⠀⠀⠀⠀⠀⣰⠃⡰⠃⠀⠀⡜⠀⡾⠀⢀⡆⠀⠀⠀
⠀⡿⢻⣄⢰⣿⡟⣿⠈⢧⠀⠀⠀⠀⢀⡀⠀⠈⣿⣿⣿⣿⣿⣿⣿⣿⣿⠃⠀⠀⠀⠀⠀⢀⠞⢁⠞⣡⣶⣄⡜⠀⣘⡠⣾⠏⠀⢰⠀⠀
⠀⠇⢸⣿⠀⢹⡿⢿⠂⠈⣧⠀⢀⠖⠉⠈⢱⠀⢿⡿⠉⠀⠈⠁⠀⣹⠇⠀⠀⠀⠀⢀⡴⢋⠀⠀⠀⠛⠓⡶⠀⡘⢁⡔⠁⠀⢠⠃⠀⠀
⠘⠀⠈⣿⡦⢼⡅⠘⡆⣀⣾⣷⡀⠳⢄⣠⠎⠀⠈⢳⣦⣤⣤⡰⠞⠁⠀⠀⠀⢀⡴⢋⣰⠋⠀⠀⠀⢀⡾⢧⣿⠟⡁⠀⢀⢾⠇⠀⠀⠀
⠀⠀⠀⠘⣿⡈⡇⠀⣟⠛⠉⠉⠛⢦⡀⠀⠀⠀⠀⠀⠀⠈⣇⡀⠀⠀⠀⢀⡤⠋⡠⣾⣿⡤⣴⡶⠀⠛⠀⣼⣃⡜⠁⢀⢞⡞⠀⠀⠀⠀
⠀⠀⠀⠀⠹⣧⣱⠼⠛⠁⠀⠀⠀⠀⢹⣦⣄⠀⠀⠀⠀⠀⢸⡇⠀⣠⢖⣩⠔⠋⣠⡋⠁⣀⢋⠀⠀⢀⣾⣿⠏⠀⢀⣞⣾⡇⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠻⣿⣆⠀⠀⠠⠀⣤⣶⣿⣿⣯⠀⢀⣀⠀⠀⠐⠒⣛⣻⠭⡔⠒⢉⠉⠁⠀⢨⢉⡀⢀⡞⣼⠏⠀⢦⣿⠏⢸⠁⠀⠀⠀⠀