--- a/src/strategies.rs
+++ b/src/strategies.rs
@@ -1,100 +1,120 @@
 //! Repair strategies for various formats
 
 use crate::error::Result;
 use crate::traits::RepairStrategy;
 use regex::Regex;
 use std::sync::OnceLock;
 
+/// Strategy priority levels
+pub mod priority {
+    pub const CRITICAL: u8 = 100;
+    pub const HIGH: u8 = 50;
+    pub const MEDIUM: u8 = 25;
+    pub const LOW: u8 = 10;
+}
+
 /// Strategy for fixing trailing commas
 pub struct FixTrailingCommasStrategy;
 
 impl RepairStrategy for FixTrailingCommasStrategy {
     fn apply(&self, content: &str) -> Result<String> {
-        let mut result = content.to_string();
+        let result = content
+            .replace(",\n}", "\n}")
+            .replace(",\n]", "\n]")
+            .replace(",}", "}")
+            .replace(",]", "]");
         
-        // Fix trailing commas before closing braces
-        result = result.replace(",\n}", "\n}");
-        result = result.replace(",\n]", "\n]");
-        
-        // Fix trailing commas on same line
-        result = result.replace(",}", "}");
-        result = result.replace(",]", "]");
-        
         Ok(result)
     }
     
     fn priority(&self) -> u8 {
-        10
+        priority::HIGH
     }
     
     fn name(&self) -> &str {
         "FixTrailingCommas"
     }
 }
 
 /// Strategy for adding missing quotes
 pub struct AddMissingQuotesStrategy;
 
 impl RepairStrategy for AddMissingQuotesStrategy {
     fn apply(&self, content: &str) -> Result<String> {
+        // Use regex to find unquoted keys and values
         static RE: OnceLock<Regex> = OnceLock::new();
         let re = RE.get_or_init(|| {
             Regex::new(r"(\s*)([a-zA-Z_][a-zA-Z0-9_]*)\s*:").unwrap()
         });
         
-        let result = re.replace_all(content, |caps: &regex::Captures| {
+        re.replace_all(content, |caps: &regex::Captures| {
             let indent = caps.get(1).map(|m| m.as_str()).unwrap_or("");
             let key = caps.get(2).map(|m| m.as_str()).unwrap_or("");
             format!("{}\"{}\":", indent, key)
-        });
+        }).to_string()
+    }
+    
+    fn priority(&self) -> u8 {
+        priority::CRITICAL
+    }
+    
+    fn name(&self) -> &str {
+        "AddMissingQuotes"
+    }
+}
+
+/// Strategy for fixing single quotes to double quotes
+pub struct FixSingleQuotesStrategy;
+
+impl RepairStrategy for FixSingleQuotesStrategy {
+    fn apply(&self, content: &str) -> Result<String> {
+        // Only replace single quotes that are used as string delimiters
+        // Be careful not to replace apostrophes in words
+        let mut result = content.to_string();
+        let mut in_string = false;
+        let mut chars: Vec<char> = result.chars().collect();
+        
+        for i in 0..chars.len() {
+            if chars[i] == '\'' && (i == 0 || chars[i-1] != '\\') {
+                // Check if this is likely a string delimiter
+                let prev_char = if i > 0 { Some(chars[i-1]) } else { None };
+                let next_char = if i < chars.len() - 1 { Some(chars[i+1]) } else { None };
+                
+                if matches!(prev_char, Some(' ' | ':' | '=' | ',' | '[' | '{')) &&
+                   matches!(next_char, Some(c) if c.is_alphanumeric() || c == ' ') {
+                    chars[i] = '"';
+                    in_string = !in_string;
+                }
+            }
+        }
+        
+        Ok(chars.into_iter().collect())
+    }
+    
+    fn priority(&self) -> u8 {
+        priority::MEDIUM
+    }
+    
+    fn name(&self) -> &str {
+        "FixSingleQuotes"
+    }
+}
+
+/// Strategy for fixing malformed numbers
+pub struct FixMalformedNumbersStrategy;
+
+impl RepairStrategy for FixMalformedNumbersStrategy {
+    fn apply(&self, content: &str) -> Result<String> {
+        static RE: OnceLock<Regex> = OnceLock::new();
+        let re = RE.get_or_init(|| {
+            Regex::new(r"(\d+)\.(\d+)\.(\d+)").unwrap()
+        });
         
-        Ok(result.to_string())
+        let result = re.replace_all(content, |caps: &regex::Captures| {
+            // This might be a version number, keep as is
+            // Or it might be a malformed decimal, fix it
+            let first = caps.get(1).unwrap().as_str();
+            let second = caps.get(2).unwrap().as_str();
+            let third = caps.get(3).unwrap().as_str();
+            
+            // If second part is very long, it's probably malformed
+            if second.len() > 10 {
+                format!("{}.{}{}", first, second, third)
+            } else {
+                format!("{}.{}.{}", first, second, third)
+            }
+        });
+        
+        Ok(result.to_string())
     }
     
     fn priority(&self) -> u8 {
-        8
+        priority::LOW
     }
     
     fn name(&self) -> &str {
-        "AddMissingQuotes"
+        "FixMalformedNumbers"
     }
 }

