successfully write binary to file

.gitignore

@@ -4,8 +4,9 @@
 **/*.rdb
 *.DS_Store
 **/*.bak
-**/.idea
+**/.idea/*
 **/.vscode
 /target
 /Cargo.lock
-.idea/**
+.idea/workspace.xml
+**/*.bin

src/gather.rs

@@ -18,7 +18,7 @@ pub struct Gather<T> {
 }
 
 #[allow(dead_code)]
-pub fn read_binary_file(file_name: &str) -> Result<Vec<u8>, String>{
+fn read_binary_file(file_name: &str) -> Result<Vec<u8>, String>{
     let raw_data = fs::read(file_name);
     let data = match raw_data {
         Ok(data) => data,
@@ -27,10 +27,49 @@ pub fn read_binary_file(file_name: &str) -> Result<Vec<u8>, String>{
     Ok(data)
 }
 
+#[allow(dead_code)]
+fn write_binary_to_file(file_path: &str, data: Vec<u8>) -> std::io::Result<()> {
+    fs::write(file_path, data)?;
+    Ok(())
+}
+
+#[allow(dead_code)]
+fn group_u8_to_f64(bytes: &[u8]) -> Vec<f64> {
+    bytes
+        .chunks_exact(8)  // Take chunks of 8 bytes
+        .map(|chunk| {
+            let mut value_bytes = [0; 8];
+            value_bytes.copy_from_slice(chunk);
+            f64::from_bits(u64::from_le_bytes(value_bytes))
+        })
+        .collect()
+}
+
+#[allow(dead_code)]
+fn split_f64_to_u8(values: &[f64]) -> Vec<u8> {
+    values
+        .iter()
+        .flat_map(|&f| {
+            let bits = f.to_bits();
+            (0..8).map(move |shift| ((bits >> (shift * 8)) & 0xFF) as u8)
+        })
+        .collect()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
+    #[test]
+    fn writes_binary_file() {
+        let double_data: Vec<f64> = vec![10.352012, -5.0272, 3.0, -2.0899];
+        let bytes = split_f64_to_u8(&double_data);
+        let file_path: &str = "./testTrace.bin";
+        let raw_data = write_binary_to_file(file_path, bytes);
+        println!("Gather: {:?}", raw_data)
+    }
+
+
     #[test]
     fn reads_binary_file() {
         let file_path: &str = "./resources/shot6220.bin";