3 files changed, 42 insertions(+), 0 deletions(-)

A .gitignore
A Cargo.toml
A src/lib.rs

@@ 1,2 @@
+/target
+/Cargo.lock

@@ 1,8 @@
+[package]
+name = "fold"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

@@ 1,32 @@
+pub fn fold(str: &'static str, len: Option<usize>) -> String {
+    let length = match len {
+        Some(length) => length,
+        None => 79,
+    };
+
+    let mut strarr: Vec<String> = vec![];
+    let mut strlen = 0;
+
+    for word in str.split(" ") {
+        let wlen = word.len() + 1;
+
+        if strlen + wlen > length {
+            strarr.push("\n".to_string());
+            strarr.push(word.to_string());
+            strarr.push(" ".to_string());
+            strlen = wlen;
+        } else if strlen + wlen == length {
+            strarr.push(word.to_string());
+            strarr.push("\n".to_string());
+            strarr.push(" ".to_string());
+            strlen = wlen;
+        } else {
+            strarr.push(word.to_string());
+            strarr.push(" ".to_string());
+            strlen += wlen;
+        }
+    }
+
+    let res: String = strarr.join("");
+    return res;
+}