remove unnecessary unsafe

src/main.rs

@@ -15,6 +15,7 @@ fn main() {
 
     loop {
         length = 0;
+
         while let Some(ch) = &mmap.get(pointer + length) {
             if **ch == b'\n' {
                 break;
@@ -31,7 +32,7 @@ fn main() {
         let mut split = line.split(|&c| c == b';');
         let station = unsafe { split.next().unwrap_unchecked() };
         let number = unsafe { split.next().unwrap_unchecked() };
-        let parsed = unsafe { parse_number(number) };
+        let parsed = parse_number(number);
         // panic!();
 
         data.entry(station)
@@ -70,7 +71,7 @@ fn main() {
     println!("}}");
 }
 
-unsafe fn parse_number(number: &[u8]) -> i64 {
+fn parse_number(number: &[u8]) -> i64 {
     unsafe {
         let sign = if *number.first().unwrap_unchecked() == b'-' {
             -1
@@ -102,6 +103,6 @@ mod tests {
     #[test]
     fn test_parse_number() {
         let input = [49, 53, 46, 51]; // "15.3"
-        assert_eq!(unsafe { parse_number(&input) }, 153);
+        assert_eq!(parse_number(&input), 153);
     }
 }