FYVZZNRQ4ZCJN7EJ7LRN4A6TYTWUG4YHRVMD4KAFYJALEBLZOBDQC
OXMYGLW2563T6VA75532P7N7CZBHVJL4VI5CQBJ6X4MOX4RKL4GAC
SXEYMYF7P4RZMZ46WPL4IZUTSQ2ATBWYZX7QNVMS3SGOYXYOHAGQC
while let Some(n) = contents.chars().position(|c| c == '\n') {
while let Some(n) = contents.as_bytes().iter().position(|&c| c == b'\n') {