Add data for course 1 assignment 4

src/util.rs

@@ -0,0 +1,21 @@
+use std::fs::File;
+use std::io;
+use std::io::{BufRead, BufReader, Error, ErrorKind};
+use std::vec::Vec;
+
+pub fn read_to_vector(path: &str) -> Result<Vec<i64>, io::Error> {
+    let file = File::open(path)?;
+    let br = BufReader::new(file);
+    let mut v = Vec::new();
+    for line in br.lines() {
+        let line = line?;
+        let n = line
+            .trim()
+            .parse()
+            .map_err(|e| Error::new(ErrorKind::InvalidData, e))?;
+        v.push(n);
+    }
+    Ok(v)
+}
+
+