added test case for search and implemented search functionality

src/lib.rs

@@ -1,8 +1,7 @@
 use std::{error::Error, fs};
 
 pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
-    let content = fs::read_to_string(config.file_path)?;
-    println!("Content:\n {}", content);
+    let _content = fs::read_to_string(config.file_path)?;
     Ok(())
 }
 
@@ -21,3 +20,30 @@ impl Config {
         Ok(Config { query, file_path })
     }
 }
+
+pub fn search<'a>(query: &str, content: &'a str) -> Vec<&'a str> {
+    let mut results = Vec::new();
+
+    for line in content.lines() {
+        if line.contains(query) {
+            results.push(line);
+        }
+    }
+    results
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn one_result() {
+        let query = "duct";
+        let content = "\
+Rust:
+safe,fast,productive.
+pick three.";
+
+        assert_eq!(vec!["safe,fast,productive."], search(query, content))
+    }
+}

src/main.rs

@@ -11,9 +11,6 @@ fn main() {
         process::exit(1);
     });
 
-    println!("Searching for {}", config.query);
-    println!("In file {}", config.file_path);
-
     if let Err(e) = minigrep::run(config) {
         println!("Application error: {e}");
         process::exit(1)