Update functions5.rs
simple typo: solusions -> solutions
@@ -42,6 +42,6 @@ fn square(num: i32) -> i32 {
// It happens because Rust distinguishes between expressions and statements: expressions return
// a value based on its operand, and statements simply return a () type which behaves just like `void` in C/C++ language.
// We want to return a value of `i32` type from the `square` function, but it is returning a `()` type...
-// They are not the same. There are two solusions:
+// They are not the same. There are two solutions:
// 1. Add a `return` ahead of `num * num;`
// 2. remove `;`, make it to be `num * num`
