Clarify variable names

Author: yoichi

Diff for: src/info.rs

@@ -489,13 +489,13 @@ impl Info {
 
     fn get_authors(git_history: &[String], n: usize) -> Vec<(String, usize, usize)> {
         let mut authors = std::collections::HashMap::new();
-        let mut names = std::collections::HashMap::new();
+        let mut author_name_by_email = std::collections::HashMap::new();
         let mut total_commits = 0;
         for line in git_history {
-            let commit_author = line.split('\t').collect::<Vec<_>>()[1].to_string();
+            let author_email = line.split('\t').collect::<Vec<_>>()[1].to_string();
             let author_name = line.split('\t').collect::<Vec<_>>()[2].to_string();
-            let commit_count = authors.entry(commit_author.to_string()).or_insert(0);
-            names.entry(commit_author.to_string()).or_insert(author_name);
+            let commit_count = authors.entry(author_email.to_string()).or_insert(0);
+            author_name_by_email.entry(author_email.to_string()).or_insert(author_name);
             *commit_count += 1;
             total_commits += 1;
         }
@@ -509,7 +509,7 @@ impl Info {
             .into_iter()
             .map(|(author, count)| {
                 (
-                    names.get(&author).unwrap().trim_matches('\'').to_string(),
+                    author_name_by_email.get(&author).unwrap().trim_matches('\'').to_string(),
                     count,
                     count * 100 / total_commits,
                 )