Disable ability to have numbers in English checker

src/checkers/english.rs

@@ -106,6 +106,9 @@ fn normalise_string(input: &str) -> String {
         .to_ascii_lowercase()
         .chars()
         .filter(|x| !x.is_ascii_punctuation())
+        // if digit is base10 filter it out
+        // Our dictionary does not contain numbers, so we want to filter them out
+        .filter(|x| !x.is_digit(10))
         .collect()
 }
 
@@ -187,4 +190,10 @@ mod tests {
         let checker = Checker::<EnglishChecker>::new();
         assert!(!checker.check("#").is_identified);
     }
+
+    #[test]
+    fn test_check_fail_single_number() {
+        let checker = Checker::<EnglishChecker>::new();
+        assert!(!checker.check("2").is_identified);
+    }
 }

src/storage/dictionaries/clean.py

@@ -12,10 +12,13 @@
 f = open(file_name)
 f2 = open("modified.txt", "w")
 for line in f:
+    line = line.strip()
     if len(line) <= MIN_LENGTH:
         continue
     if len(set(line).intersection(PUNC)) != 0:
         continue
+    if not line.isalpha():
+        continue
     if LOWERCASE:
         line = line.lower()
     f2.write(line)