completed till 11

exercises/06_ticket_management/10_slices/src/lib.rs

@@ -1,6 +1,9 @@
 // TODO: Define a function named `sum` that takes a reference to a slice of `u32` and returns the sum of all
 //  elements in the slice.
 
+fn sum(v: &[u32]) -> u32 {
+    v.iter().sum()
+}
 #[cfg(test)]
 mod tests {
     use super::*;